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Weekly Global IPv4 Routing Table Report
by Routing Table Analysis Role Account 21 Nov '25

21 Nov '25

This is an automated weekly mailing describing the state of the Global IPv4 Routing Table as seen from APNIC's router in Japan. The posting is sent to APOPS, NANOG, AfNOG, SANOG, PacNOG, SAFNOG UKNOF, TZNOG, MENOG, BJNOG, SDNOG, CMNOG, LACNOG and the RIPE Routing WG. Daily listings are sent to bgp-stats(a)lists.apnic.net. For historical data, please see https://thyme.apnic.net. If you have any comments please contact Philip Smith <pfsinoz(a)gmail.com>. IPv4 Routing Table Report 04:00 +10GMT Sat 22 Nov, 2025 IPv4 BGP Table (Global) as seen at Japan. Report Website: https://thyme.apnic.net Detailed Analysis: https://thyme.apnic.net/current/ Analysis Summary ---------------- BGP routing table entries examined: 1016324 Prefixes after maximum aggregation (per Origin AS): 393514 Deaggregation factor: 2.58 Unique aggregates announced (without unneeded subnets): 503075 Number of IPv4 prefixes with a valid ROA: 585643 Number of IPv4 prefixes with an invalid ROA: 1437 Number of IPv4 prefixes with no ROA: 429244 Total ASes present in the Internet Routing Table: 77554 Prefixes per ASN: 13.10 Origin-only ASes present in the Internet Routing Table: 66599 Origin ASes announcing only one prefix: 27087 Transit ASes present in the Internet Routing Table: 10955 Transit-only ASes present in the Internet Routing Table: 549 Average AS path length visible in the Internet Routing Table: 4.7 Max AS path length visible: 57 Max AS path prepend of ASN ( 37447) 53 Prefixes from unregistered ASNs in the Routing Table: 1028 Number of instances of unregistered ASNs: 1067 Number of 32-bit ASNs allocated by the RIRs: 48025 Number of 32-bit ASNs visible in the Routing Table: 39333 Prefixes from 32-bit ASNs in the Routing Table: 216292 Number of bogon 32-bit ASNs visible in the Routing Table: 112 Special use prefixes present in the Routing Table: 1 Prefixes being announced from unallocated address space: 489 Number of addresses announced to Internet: 3099978368 Equivalent to 184 /8s, 197 /16s and 234 /24s Percentage of available address space announced: 83.7 Percentage of allocated address space announced: 83.7 Percentage of available address space allocated: 100.0 Percentage of address space in use by end-sites: 99.6 Total number of prefixes smaller than registry allocations: 333091 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 274000 Total APNIC prefixes after maximum aggregation: 81255 APNIC Deaggregation factor: 3.37 Prefixes being announced from the APNIC address blocks: 262023 Unique aggregates announced from the APNIC address blocks: 106374 APNIC Region origin ASes present in the Internet Routing Table: 14898 APNIC Prefixes per ASN: 17.59 APNIC Region origin ASes announcing only one prefix: 4538 APNIC Region transit ASes present in the Internet Routing Table: 1975 Average APNIC Region AS path length visible: 4.7 Max APNIC Region AS path length visible: 34 Number of APNIC region 32-bit ASNs visible in the Routing Table: 10450 Number of APNIC addresses announced to Internet: 752650752 Equivalent to 44 /8s, 220 /16s and 138 /24s APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431 (pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319, 58368-59391, 63488-64098, 64297-64395, 131072-155961 APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8, 49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8, 106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8, 116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8, 123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8, 163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8, 222/8, 223/8, ARIN Region Analysis Summary ---------------------------- Prefixes being announced by ARIN Region ASes: 298470 Total ARIN prefixes after maximum aggregation: 134034 ARIN Deaggregation factor: 2.23 Prefixes being announced from the ARIN address blocks: 298411 Unique aggregates announced from the ARIN address blocks: 145507 ARIN Region origin ASes present in the Internet Routing Table: 19366 ARIN Prefixes per ASN: 15.41 ARIN Region origin ASes announcing only one prefix: 7088 ARIN Region transit ASes present in the Internet Routing Table: 1945 Average ARIN Region AS path length visible: 4.3 Max ARIN Region AS path length visible: 28 Number of ARIN region 32-bit ASNs visible in the Routing Table: 5406 Number of ARIN addresses announced to Internet: 1337553152 Equivalent to 79 /8s, 185 /16s and 113 /24s ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106 (pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153 3354-4607, 4865-5119, 5632-6655, 6912-7466 7723-8191, 10240-12287, 13312-15359, 16384-17407 18432-20479, 21504-23551, 25600-26591, 26624-27647, 29696-30719, 31744-33791 35840-36863, 39936-40959, 46080-47103 53248-55295, 62464-63487, 64198-64296, 393216-402332 ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8, 12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8, 20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8, 29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8, 40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8, 54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8, 131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8, 139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8, 148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8, 159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8, 167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8, 184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8, 207/8, 208/8, 209/8, 214/8, 215/8, 216/8, RIPE Region Analysis Summary ---------------------------- Prefixes being announced by RIPE Region ASes: 282107 Total RIPE prefixes after maximum aggregation: 139903 RIPE Deaggregation factor: 2.02 Prefixes being announced from the RIPE address blocks: 282728 Unique aggregates announced from the RIPE address blocks: 183233 RIPE Region origin ASes present in the Internet Routing Table: 29112 RIPE Prefixes per ASN: 9.71 RIPE Region origin ASes announcing only one prefix: 12075 RIPE Region transit ASes present in the Internet Routing Table: 3962 Average RIPE Region AS path length visible: 4.8 Max RIPE Region AS path length visible: 31 Number of RIPE region 32-bit ASNs visible in the Routing Table: 12824 Number of RIPE addresses announced to Internet: 735536768 Equivalent to 43 /8s, 215 /16s and 102 /24s RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614 (pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631 6656-6911, 8192-9215, 12288-13311, 15360-16383 20480-21503, 24576-25599, 28672-29695 30720-31743, 33792-35839, 38912-39935 40960-45055, 47104-52223, 56320-58367 59392-61439, 61952-62463, 64396-64495 196608-216475 RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8, 53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8, 185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8, 217/8, LACNIC Region Analysis Summary ------------------------------ Prefixes being announced by LACNIC Region ASes: 125316 Total LACNIC prefixes after maximum aggregation: 30744 LACNIC Deaggregation factor: 4.08 Prefixes being announced from the LACNIC address blocks: 121373 Unique aggregates announced from the LACNIC address blocks: 49577 LACNIC Region origin ASes present in the Internet Routing Table: 11301 LACNIC Prefixes per ASN: 10.74 LACNIC Region origin ASes announcing only one prefix: 2662 LACNIC Region transit ASes present in the Internet Routing Table: 2531 Average LACNIC Region AS path length visible: 5.4 Max LACNIC Region AS path length visible: 38 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 9300 Number of LACNIC addresses announced to Internet: 170775808 Equivalent to 10 /8s, 45 /16s and 213 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-274844 + ERX transfers LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8, 191/8, 200/8, 201/8, AfriNIC Region Analysis Summary ------------------------------- Prefixes being announced by AfriNIC Region ASes: 35403 Total AfriNIC prefixes after maximum aggregation: 6889 AfriNIC Deaggregation factor: 5.14 Prefixes being announced from the AfriNIC address blocks: 51300 Unique aggregates announced from the AfriNIC address blocks: 17984 AfriNIC Region origin ASes present in the Internet Routing Table: 1988 AfriNIC Prefixes per ASN: 25.80 AfriNIC Region origin ASes announcing only one prefix: 724 AfriNIC Region transit ASes present in the Internet Routing Table: 378 Average AfriNIC Region AS path length visible: 5.3 Max AfriNIC Region AS path length visible: 57 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 1353 Number of AfriNIC addresses announced to Internet: 103214336 Equivalent to 6 /8s, 38 /16s and 237 /24s AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8, APNIC Region per AS prefix count summary ---------------------------------------- ASN No of nets /20 equiv MaxAgg Description 9808 13465 8760 120 CHINAMOBILE-CN China Mobile Communication 7545 6068 833 595 TPG-INTERNET-AP TPG Telecom Limited, AU 4538 5013 4193 77 ERX-CERNET-BKB China Education and Resear 9498 4560 540 334 BBIL-AP BHARTI Airtel Ltd., IN 7552 3982 1332 28 VIETEL-AS-AP Viettel Group, VN 7713 3706 1044 66 TELKOMNET-AS-AP PT Telekomunikasi Indones 45899 3325 1869 99 VNPT-AS-VN VNPT Corp, VN 56046 3246 827 182 CMNET-JIANGSU-AP China Mobile communicati 24560 2947 865 503 AIRTELBROADBAND-AS-AP Bharti Airtel Ltd., 140292 2493 274 1922 CHINATELECOM-JIANGSU-SUZHOU-5G-NETWORK CH Complete listing at https://thyme.apnic.net/current/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 16509 14140 37184 5381 AMAZON-02, US 11492 4789 317 804 CABLEONE, US 22773 4733 3113 367 ASN-CXA-ALL-CCI-22773-RDC, US 7155 3861 286 85 VIASAT-SP-BACKBONE, US 6327 3691 1320 83 SHAW, CA 396982 3299 4860 477 GOOGLE-CLOUD-PLATFORM, US 749 3217 54766 2468 DNIC-AS-00749, US 16625 2873 1229 2147 AKAMAI-AS, US 36352 2854 231 912 AS-COLOCROSSING, US 30036 2665 368 305 MEDIACOM-ENTERPRISE-BUSINESS, US Complete listing at https://thyme.apnic.net/current/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 12479 7294 1711 149 UNI2-AS, ES 39891 4833 298 66 ALJAWWALSTC-AS, SA 9009 4026 381 2290 M247, RO 20940 3875 3395 126 AKAMAI-ASN1, NL 12389 3157 2317 871 ROSTELECOM-AS PJSC Rostelecom. Technical 212238 2509 178 1812 CDNEXT, GB 34984 2419 363 577 TELLCOM-AS, TR 8452 1698 1852 14 TE-AS TE-AS, EG 13188 1607 100 27 TRIOLAN, UA 203020 1485 169 856 HOSTROYALE, IN Complete listing at https://thyme.apnic.net/current/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 8151 12551 3305 577 UNINET, MX 10620 3457 463 1100 Telmex Colombia S.A., CO 13999 2503 511 346 Mega Cable, S.A. de C.V., MX 11830 1992 369 65 Instituto Costarricense de Electricidad y 28573 1372 2433 261 Claro NXT Telecomunicacoes Ltda, BR 3816 1350 789 206 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC, 6147 1264 371 22 Telefonica del Peru S.A.A., PE 22884 1057 67 364 TOTAL PLAY TELECOMUNICACIONES SA DE CV, M 26615 1016 2486 56 TIM SA, BR 18881 914 1127 31 TELEFONICA BRASIL S.A, BR Complete listing at https://thyme.apnic.net/current/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 24835 1985 630 32 RAYA-AS, EG 36992 1680 1509 397 ETISALAT-MISR, EG 24863 1265 389 20 LINKdotNET-AS, EG 36903 1250 554 97 MT-MPLS, MA 36935 1106 523 36 Vodafone-, EG 37069 1086 1112 11 MOBINIL, EG 29571 1072 94 22 ORANGE-COTE-IVOIRE, CI 20011 580 154 212 NTT-DATA-Inc, ZA 36914 572 82 3 KENET-AS, KE 15399 550 57 56 WANANCHI-, KE Complete listing at https://thyme.apnic.net/current/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 16509 14140 37184 5381 AMAZON-02, US 9808 13465 8760 120 CHINAMOBILE-CN China Mobile Communication 8151 12551 3305 577 UNINET, MX 12479 7294 1711 149 UNI2-AS, ES 7545 6068 833 595 TPG-INTERNET-AP TPG Telecom Limited, AU 4538 5013 4193 77 ERX-CERNET-BKB China Education and Resear 39891 4833 298 66 ALJAWWALSTC-AS, SA 11492 4789 317 804 CABLEONE, US 22773 4733 3113 367 ASN-CXA-ALL-CCI-22773-RDC, US 9498 4560 540 334 BBIL-AP BHARTI Airtel Ltd., IN Complete listing at https://thyme.apnic.net/current/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 9808 13465 13345 CHINAMOBILE-CN China Mobile Communications Grou 8151 12551 11974 UNINET, MX 12479 7294 7145 UNI2-AS, ES 7545 6068 5473 TPG-INTERNET-AP TPG Telecom Limited, AU 4538 5013 4936 ERX-CERNET-BKB China Education and Research Net 39891 4833 4767 ALJAWWALSTC-AS, SA 22773 4733 4366 ASN-CXA-ALL-CCI-22773-RDC, US 9498 4560 4226 BBIL-AP BHARTI Airtel Ltd., IN 11492 4789 3985 CABLEONE, US 7552 3982 3954 VIETEL-AS-AP Viettel Group, VN Complete listing at https://thyme.apnic.net/current/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 393266 UNALLOCATED 8.23.52.0/24 46887 CROWNCASTLE-AS46887, US 396894 UNALLOCATED 8.28.201.0/24 3356 LEVEL3, US 394936 UNALLOCATED 8.33.224.0/24 22442 HOU-PHONOSCOPE, US 54338 UNALLOCATED 8.33.241.0/24 6461 ZAYO-6461, US 395195 UNALLOCATED 8.38.115.0/24 3356 LEVEL3, US 1782 UNALLOCATED 8.42.19.0/24 3356 LEVEL3, US 54739 UNALLOCATED 8.44.198.0/23 13335 CLOUDFLARENET, US 13342 UNALLOCATED 12.17.5.0/24 174 COGENT-174, US 26345 UNALLOCATED 12.21.93.0/24 40264 TWC-40264-WI-MN-UPPERMI 396831 UNALLOCATED 12.23.198.0/24 7018 ATT-INTERNET4, US Complete listing at https://thyme.apnic.net/current/data-badAS Prefixes from the Special Purpose Address Registry (Global) ----------------------------------------------------------- Prefix Origin AS Description 192.88.99.0/24 6939 HURRICANE, US Complete listing at https://thyme.apnic.net/current/data-spar Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 23.135.216.0/24 Origin: 400565 RESERVED, ZZ 23.135.216.0/24 Transit: 3356 LEVEL3, US 23.137.48.0/24 Origin: 16904 ARVIG-16904, US 23.137.48.0/24 Transit: 3257 GTT-BACKBONE GTT, US 23.137.200.0/24 Origin: 16276 OVH, FR 23.137.200.0/24 Transit: 2516 KDDI KDDI CORPORATION, JP 23.137.224.0/24 Origin: 29802 HVC-AS, US 23.137.224.0/24 Transit: 6939 HURRICANE, US 23.137.225.0/24 Origin: 29802 HVC-AS, US 23.137.225.0/24 Transit: 6939 HURRICANE, US Complete listing at https://thyme.apnic.net/current/data-add-IANA Number of prefixes announced per prefix length (Global) ------------------------------------------------------- /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:16 /9:14 /10:41 /11:94 /12:297 /13:580 /14:1195 /15:2093 /16:13703 /17:8298 /18:13568 /19:24980 /20:45422 /21:52557 /22:113418 /23:105201 /24:634147 /25:700 /26:0 /27:0 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 8151 6750 12551 UNINET, MX 12479 6236 7294 UNI2-AS, ES 11492 3602 4789 CABLEONE, US 39891 3521 4833 ALJAWWALSTC-AS, SA 6327 3478 3691 SHAW, CA 22773 3022 4733 ASN-CXA-ALL-CCI-22773-RDC, US 7155 2820 3861 VIASAT-SP-BACKBONE, US 16509 2423 14140 AMAZON-02, US 30036 2320 2665 MEDIACOM-ENTERPRISE-BUSINESS, US 10620 2212 3457 Telmex Colombia S.A., CO Complete listing at https://thyme.apnic.net/current/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1803 2:1542 3:962 4:10 5:4921 6:189 7:6 8:1528 9:6 11:172 12:1229 13:546 14:2640 15:412 16:303 17:388 18:905 20:585 21:4 22:188 23:8094 24:2564 25:2 27:2716 29:19 31:3395 32:32 33:1 34:81 35:288 36:4543 37:4579 38:9327 39:1176 40:459 41:4406 42:957 43:2796 44:401 45:19328 46:5103 47:376 49:2146 50:2049 51:594 52:1565 54:287 55:1110 56:11 57:291 58:2211 59:1375 60:1186 61:3048 62:3074 63:1739 64:5944 65:2116 66:5906 67:3239 68:1491 69:4164 70:1035 71:625 72:2992 74:2928 75:1519 76:603 77:2765 78:1909 79:1780 80:2300 81:2119 82:3767 83:1468 84:2026 85:3583 86:1107 87:2400 88:1337 89:4614 90:837 91:8405 92:2842 93:2994 94:4230 95:4572 96:1461 97:313 98:952 99:767 100:68 101:1089 102:4286 103:32196 104:5493 105:778 106:917 107:2797 108:1203 109:4225 110:2278 111:3925 112:2754 113:1627 114:2091 115:2209 116:2125 117:3100 118:2551 119:2037 120:2374 121:1563 122:2961 123:2289 124:1667 125:2936 126:125 128:1585 129:969 130:1507 131:2241 132:782 133:462 134:1635 135:385 136:1494 137:1201 138:2841 139:1591 140:1792 141:1556 142:2282 143:2133 144:1311 145:634 146:2187 147:2144 148:2790 149:2854 150:1293 151:2661 152:2284 153:606 154:8981 155:2252 156:4075 157:2192 158:1450 159:2676 160:3675 161:1988 162:3999 163:2326 164:1955 165:2600 166:1313 167:2144 168:3877 169:790 170:5419 171:1109 172:4477 173:3424 174:914 175:1337 176:3751 177:4704 178:4328 179:2262 180:2833 181:4340 182:3811 183:2323 184:2062 185:21691 186:5431 187:4728 188:4400 189:4437 190:9680 191:1548 192:11465 193:9524 194:7858 195:5609 196:3245 197:3196 198:6239 199:6101 200:8216 201:6371 202:10631 203:10501 204:4627 205:3718 206:4398 207:3896 208:4255 209:5448 210:4981 211:2747 212:4901 213:4009 214:1041 215:52 216:7109 217:3340 218:1629 219:575 220:2193 221:1270 222:900 223:3138 End of report

1 0

CAMTEL leaking 4/8 and 8/8
by John Kristoff 21 Nov '25

21 Nov '25

CAMTEL (AS15964) has been originating routes for 4.0.0.0/8 and 8.0.0.0/8 for awhile, which Telxius Telephonica (AS12956) seems to be accepting and relaying to anyone else who will listen. There are some more specific prefixes for much of the covered space, but not all. Presumably a fair bit of traffic to that unused space is reaching Telxius/CAMTEL and some seems to be looping. I imagine AS 3356 might wish to see these announcements cease. I tried a few listed contacts for 12956, but if anyone has a better path to reach out to someone it might be helpful. John

2 2

Cf kill switch?
by Dmitry Sherman 19 Nov '25

19 Nov '25

Hello guys from CF please allow the "pause CF" button to work via API or via any other way even if there is an outage. Thanks.

6 6

Do you use or see FQDN capability?
by John Kristoff 19 Nov '25

19 Nov '25

I'd be interested in hearing if people set a hostname on their BGP routers and send it to peers (internal and/or external). I'm also interested in hearing if you see external peers sending it to you. I know BIRD and FRR support this capability, but I"m not aware of others and I'm guessing it is relatively rare in practice? Reference: <https://datatracker.ietf.org/doc/html/draft-walton-bgp-hostname-capability-…> Yes, a long-expired draft. John

9 12

Re: Do you use or see FQDN capability?
by Saku Ytti 18 Nov '25

18 Nov '25

On Tue, 18 Nov 2025 at 17:04, Dale W. Carder <dwcarder(a)uwalumni.com> wrote: > It's hard to discern implicit from explicit behavior. In RFC1771, > there is no global uniqueness requirement for the ID, it is just to > be mapped to a host address. So, it must be that hosts were to be > required to be globally unique, but I realized even RFC 1597 existed > by then. Apologies for failing to communicate that RFC1771 explicitly requires a unique routerID. --- 1. The BGP Identifier of the local system is compared to the BGP Identifier of the remote system (as specified in the OPEN message). 2. If the value of the local BGP Identifier is less than the remote one, the local system closes BGP connection that already exists (the one that is already in the OpenConfirm state), and accepts BGP connection initiated by the remote system. 3. Otherwise, the local system closes newly created BGP connection (the one associated with the newly received OPEN message), and continues to use the existing one (the one that is already in the OpenConfirm state). Comparing BGP Identifiers is done by treating them as (4-octet long) unsigned integers. --- Without unique routerID these two ASN may have identical routerID, therefore the collision mechanism does not work. -- ++ytti

1 0

Weekly Global IPv4 Routing Table Report
by Routing Table Analysis Role Account 14 Nov '25

14 Nov '25

This is an automated weekly mailing describing the state of the Global IPv4 Routing Table as seen from APNIC's router in Japan. The posting is sent to APOPS, NANOG, AfNOG, SANOG, PacNOG, SAFNOG UKNOF, TZNOG, MENOG, BJNOG, SDNOG, CMNOG, LACNOG and the RIPE Routing WG. Daily listings are sent to bgp-stats(a)lists.apnic.net. For historical data, please see https://thyme.apnic.net. If you have any comments please contact Philip Smith <pfsinoz(a)gmail.com>. IPv4 Routing Table Report 04:00 +10GMT Sat 15 Nov, 2025 IPv4 BGP Table (Global) as seen at Japan. Report Website: https://thyme.apnic.net Detailed Analysis: https://thyme.apnic.net/current/ Analysis Summary ---------------- BGP routing table entries examined: 1013317 Prefixes after maximum aggregation (per Origin AS): 392751 Deaggregation factor: 2.58 Unique aggregates announced (without unneeded subnets): 501501 Number of IPv4 prefixes with a valid ROA: 582545 Number of IPv4 prefixes with an invalid ROA: 1441 Number of IPv4 prefixes with no ROA: 429331 Total ASes present in the Internet Routing Table: 77535 Prefixes per ASN: 13.07 Origin-only ASes present in the Internet Routing Table: 66599 Origin ASes announcing only one prefix: 27093 Transit ASes present in the Internet Routing Table: 10936 Transit-only ASes present in the Internet Routing Table: 544 Average AS path length visible in the Internet Routing Table: 4.7 Max AS path length visible: 58 Max AS path prepend of ASN ( 37447) 54 Prefixes from unregistered ASNs in the Routing Table: 955 Number of instances of unregistered ASNs: 998 Number of 32-bit ASNs allocated by the RIRs: 47999 Number of 32-bit ASNs visible in the Routing Table: 39280 Prefixes from 32-bit ASNs in the Routing Table: 215338 Number of bogon 32-bit ASNs visible in the Routing Table: 120 Special use prefixes present in the Routing Table: 1 Prefixes being announced from unallocated address space: 413 Number of addresses announced to Internet: 3103792512 Equivalent to 185 /8s, 0 /16s and 29 /24s Percentage of available address space announced: 83.8 Percentage of allocated address space announced: 83.8 Percentage of available address space allocated: 100.0 Percentage of address space in use by end-sites: 99.6 Total number of prefixes smaller than registry allocations: 332792 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 271850 Total APNIC prefixes after maximum aggregation: 80860 APNIC Deaggregation factor: 3.36 Prefixes being announced from the APNIC address blocks: 261601 Unique aggregates announced from the APNIC address blocks: 106226 APNIC Region origin ASes present in the Internet Routing Table: 14890 APNIC Prefixes per ASN: 17.57 APNIC Region origin ASes announcing only one prefix: 4537 APNIC Region transit ASes present in the Internet Routing Table: 1976 Average APNIC Region AS path length visible: 4.7 Max APNIC Region AS path length visible: 34 Number of APNIC region 32-bit ASNs visible in the Routing Table: 10436 Number of APNIC addresses announced to Internet: 749225472 Equivalent to 44 /8s, 168 /16s and 70 /24s APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431 (pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319, 58368-59391, 63488-64098, 64297-64395, 131072-155961 APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8, 49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8, 106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8, 116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8, 123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8, 163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8, 222/8, 223/8, ARIN Region Analysis Summary ---------------------------- Prefixes being announced by ARIN Region ASes: 298122 Total ARIN prefixes after maximum aggregation: 133970 ARIN Deaggregation factor: 2.23 Prefixes being announced from the ARIN address blocks: 298027 Unique aggregates announced from the ARIN address blocks: 145342 ARIN Region origin ASes present in the Internet Routing Table: 19383 ARIN Prefixes per ASN: 15.38 ARIN Region origin ASes announcing only one prefix: 7103 ARIN Region transit ASes present in the Internet Routing Table: 1947 Average ARIN Region AS path length visible: 4.3 Max ARIN Region AS path length visible: 28 Number of ARIN region 32-bit ASNs visible in the Routing Table: 5408 Number of ARIN addresses announced to Internet: 1345008384 Equivalent to 80 /8s, 43 /16s and 51 /24s ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106 (pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153 3354-4607, 4865-5119, 5632-6655, 6912-7466 7723-8191, 10240-12287, 13312-15359, 16384-17407 18432-20479, 21504-23551, 25600-26591, 26624-27647, 29696-30719, 31744-33791 35840-36863, 39936-40959, 46080-47103 53248-55295, 62464-63487, 64198-64296, 393216-402332 ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8, 12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8, 20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8, 29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8, 40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8, 54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8, 131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8, 139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8, 148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8, 159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8, 167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8, 184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8, 207/8, 208/8, 209/8, 214/8, 215/8, 216/8, RIPE Region Analysis Summary ---------------------------- Prefixes being announced by RIPE Region ASes: 281643 Total RIPE prefixes after maximum aggregation: 139594 RIPE Deaggregation factor: 2.02 Prefixes being announced from the RIPE address blocks: 282106 Unique aggregates announced from the RIPE address blocks: 182569 RIPE Region origin ASes present in the Internet Routing Table: 29103 RIPE Prefixes per ASN: 9.69 RIPE Region origin ASes announcing only one prefix: 12081 RIPE Region transit ASes present in the Internet Routing Table: 3956 Average RIPE Region AS path length visible: 4.8 Max RIPE Region AS path length visible: 31 Number of RIPE region 32-bit ASNs visible in the Routing Table: 12802 Number of RIPE addresses announced to Internet: 735427200 Equivalent to 43 /8s, 213 /16s and 186 /24s RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614 (pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631 6656-6911, 8192-9215, 12288-13311, 15360-16383 20480-21503, 24576-25599, 28672-29695 30720-31743, 33792-35839, 38912-39935 40960-45055, 47104-52223, 56320-58367 59392-61439, 61952-62463, 64396-64495 196608-216475 RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8, 53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8, 185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8, 217/8, LACNIC Region Analysis Summary ------------------------------ Prefixes being announced by LACNIC Region ASes: 125322 Total LACNIC prefixes after maximum aggregation: 30783 LACNIC Deaggregation factor: 4.07 Prefixes being announced from the LACNIC address blocks: 121398 Unique aggregates announced from the LACNIC address blocks: 49580 LACNIC Region origin ASes present in the Internet Routing Table: 11310 LACNIC Prefixes per ASN: 10.73 LACNIC Region origin ASes announcing only one prefix: 2657 LACNIC Region transit ASes present in the Internet Routing Table: 2519 Average LACNIC Region AS path length visible: 5.4 Max LACNIC Region AS path length visible: 38 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 9289 Number of LACNIC addresses announced to Internet: 170840064 Equivalent to 10 /8s, 46 /16s and 208 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-274844 + ERX transfers LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8, 191/8, 200/8, 201/8, AfriNIC Region Analysis Summary ------------------------------- Prefixes being announced by AfriNIC Region ASes: 35425 Total AfriNIC prefixes after maximum aggregation: 6886 AfriNIC Deaggregation factor: 5.14 Prefixes being announced from the AfriNIC address blocks: 49772 Unique aggregates announced from the AfriNIC address blocks: 17420 AfriNIC Region origin ASes present in the Internet Routing Table: 1981 AfriNIC Prefixes per ASN: 25.12 AfriNIC Region origin ASes announcing only one prefix: 715 AfriNIC Region transit ASes present in the Internet Routing Table: 376 Average AfriNIC Region AS path length visible: 5.4 Max AfriNIC Region AS path length visible: 58 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 1345 Number of AfriNIC addresses announced to Internet: 103069184 Equivalent to 6 /8s, 36 /16s and 182 /24s AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8, APNIC Region per AS prefix count summary ---------------------------------------- ASN No of nets /20 equiv MaxAgg Description 9808 13464 8760 120 CHINAMOBILE-CN China Mobile Communication 7545 6092 833 589 TPG-INTERNET-AP TPG Telecom Limited, AU 4538 4977 4193 77 ERX-CERNET-BKB China Education and Resear 9498 4529 539 318 BBIL-AP BHARTI Airtel Ltd., IN 7552 3974 1332 28 VIETEL-AS-AP Viettel Group, VN 7713 3721 1044 66 TELKOMNET-AS-AP PT Telekomunikasi Indones 45899 3324 1869 99 VNPT-AS-VN VNPT Corp, VN 56046 3246 827 182 CMNET-JIANGSU-AP China Mobile communicati 24560 2940 864 510 AIRTELBROADBAND-AS-AP Bharti Airtel Ltd., 140292 2493 274 1922 CHINATELECOM-JIANGSU-SUZHOU-5G-NETWORK CH Complete listing at https://thyme.apnic.net/current/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 16509 14242 37266 5366 AMAZON-02, US 11492 4785 317 804 CABLEONE, US 22773 4677 3110 385 ASN-CXA-ALL-CCI-22773-RDC, US 7155 3861 286 85 VIASAT-SP-BACKBONE, US 6327 3691 1320 83 SHAW, CA 396982 3287 4827 472 GOOGLE-CLOUD-PLATFORM, US 749 3216 54766 2467 DNIC-AS-00749, US 16625 2890 1235 2157 AKAMAI-AS, US 36352 2851 231 913 AS-COLOCROSSING, US 174 2676 8763 818 COGENT-174, US Complete listing at https://thyme.apnic.net/current/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 12479 7290 1711 149 UNI2-AS, ES 39891 4833 298 66 ALJAWWALSTC-AS, SA 9009 4028 382 2291 M247, RO 20940 3866 3395 126 AKAMAI-ASN1, NL 12389 3166 2317 869 ROSTELECOM-AS PJSC Rostelecom. Technical 212238 2471 175 1778 CDNEXT, GB 34984 2418 363 576 TELLCOM-AS, TR 8452 1684 1852 13 TE-AS TE-AS, EG 13188 1607 100 27 TRIOLAN, UA 203020 1469 167 846 HOSTROYALE, IN Complete listing at https://thyme.apnic.net/current/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 8151 12545 3315 578 UNINET, MX 10620 3455 463 1098 Telmex Colombia S.A., CO 13999 2505 511 345 Mega Cable, S.A. de C.V., MX 11830 1992 369 65 Instituto Costarricense de Electricidad y 28573 1373 2433 261 Claro NXT Telecomunicacoes Ltda, BR 3816 1353 789 206 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC, 6147 1276 371 22 Telefonica del Peru S.A.A., PE 22884 1057 67 362 TOTAL PLAY TELECOMUNICACIONES SA DE CV, M 26615 1026 2486 56 TIM SA, BR 18881 912 1127 31 TELEFONICA BRASIL S.A, BR Complete listing at https://thyme.apnic.net/current/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 24835 1985 630 32 RAYA-AS, EG 36992 1680 1509 397 ETISALAT-MISR, EG 24863 1265 389 20 LINKdotNET-AS, EG 36903 1250 554 97 MT-MPLS, MA 36935 1106 523 36 Vodafone-, EG 37069 1086 1112 11 MOBINIL, EG 29571 1070 94 22 ORANGE-COTE-IVOIRE, CI 20011 580 154 212 NTT-DATA-Inc, ZA 36914 567 82 3 KENET-AS, KE 15399 547 57 56 WANANCHI-, KE Complete listing at https://thyme.apnic.net/current/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 16509 14242 37266 5366 AMAZON-02, US 9808 13464 8760 120 CHINAMOBILE-CN China Mobile Communication 8151 12545 3315 578 UNINET, MX 12479 7290 1711 149 UNI2-AS, ES 7545 6092 833 589 TPG-INTERNET-AP TPG Telecom Limited, AU 4538 4977 4193 77 ERX-CERNET-BKB China Education and Resear 39891 4833 298 66 ALJAWWALSTC-AS, SA 11492 4785 317 804 CABLEONE, US 22773 4677 3110 385 ASN-CXA-ALL-CCI-22773-RDC, US 9498 4529 539 318 BBIL-AP BHARTI Airtel Ltd., IN Complete listing at https://thyme.apnic.net/current/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 9808 13464 13344 CHINAMOBILE-CN China Mobile Communications Grou 8151 12545 11967 UNINET, MX 12479 7290 7141 UNI2-AS, ES 7545 6092 5503 TPG-INTERNET-AP TPG Telecom Limited, AU 4538 4977 4900 ERX-CERNET-BKB China Education and Research Net 39891 4833 4767 ALJAWWALSTC-AS, SA 22773 4677 4292 ASN-CXA-ALL-CCI-22773-RDC, US 9498 4529 4211 BBIL-AP BHARTI Airtel Ltd., IN 11492 4785 3981 CABLEONE, US 7552 3974 3946 VIETEL-AS-AP Viettel Group, VN Complete listing at https://thyme.apnic.net/current/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 53775 UNALLOCATED 8.20.88.0/24 3737 AS-PTD, US 393266 UNALLOCATED 8.23.52.0/24 46887 CROWNCASTLE-AS46887, US 396894 UNALLOCATED 8.28.201.0/24 3356 LEVEL3, US 394936 UNALLOCATED 8.33.224.0/24 22442 HOU-PHONOSCOPE, US 54338 UNALLOCATED 8.33.241.0/24 6461 ZAYO-6461, US 395195 UNALLOCATED 8.38.115.0/24 3356 LEVEL3, US 1782 UNALLOCATED 8.42.19.0/24 3356 LEVEL3, US 54739 UNALLOCATED 8.44.198.0/23 13335 CLOUDFLARENET, US 13342 UNALLOCATED 12.17.5.0/24 174 COGENT-174, US 26345 UNALLOCATED 12.21.93.0/24 40264 TWC-40264-WI-MN-UPPERMI Complete listing at https://thyme.apnic.net/current/data-badAS Prefixes from the Special Purpose Address Registry (Global) ----------------------------------------------------------- Prefix Origin AS Description 192.88.99.0/24 6939 HURRICANE, US Complete listing at https://thyme.apnic.net/current/data-spar Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 23.135.216.0/24 Origin: 400565 RESERVED, ZZ 23.135.216.0/24 Transit: 3356 LEVEL3, US 23.141.0.0/24 Origin: 395350 RESERVED, ZZ 23.141.0.0/24 Transit: 11426 TWC-11426-CAROLINAS, US 23.142.24.0/24 Origin: 62164 HEYMMAN-2, CA 23.142.24.0/24 Transit: 64236 UNREAL-SERVERS, US 23.147.240.0/24 Origin: 32302 RESERVED, ZZ 23.147.240.0/24 Transit: 32787 PROLEXIC-TECHNOLOGIES-DDOS-MITIGATION-NE 23.159.56.0/24 Origin: 174 COGENT-174, US 23.159.56.0/24 Transit: 2497 IIJ Internet Initiative Japan Inc., JP Complete listing at https://thyme.apnic.net/current/data-add-IANA Number of prefixes announced per prefix length (Global) ------------------------------------------------------- /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:18 /9:14 /10:41 /11:94 /12:298 /13:580 /14:1194 /15:2094 /16:13704 /17:8283 /18:13553 /19:24981 /20:45286 /21:52544 /22:113332 /23:105144 /24:631460 /25:697 /26:0 /27:0 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 8151 6747 12545 UNINET, MX 12479 6232 7290 UNI2-AS, ES 11492 3598 4785 CABLEONE, US 39891 3521 4833 ALJAWWALSTC-AS, SA 6327 3478 3691 SHAW, CA 22773 2997 4677 ASN-CXA-ALL-CCI-22773-RDC, US 7155 2820 3861 VIASAT-SP-BACKBONE, US 16509 2426 14242 AMAZON-02, US 30036 2317 2661 MEDIACOM-ENTERPRISE-BUSINESS, US 10620 2210 3455 Telmex Colombia S.A., CO Complete listing at https://thyme.apnic.net/current/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1804 2:1539 3:963 4:10 5:4875 6:189 7:6 8:1534 9:6 11:172 12:1233 13:551 14:2637 15:411 16:303 17:387 18:905 20:583 21:4 22:188 23:8045 24:2562 25:2 27:2725 29:19 31:3365 32:32 33:1 34:81 35:277 36:4542 37:4575 38:9320 39:1176 40:458 41:4448 42:958 43:2784 44:401 45:19174 46:5153 47:376 49:2148 50:2054 51:592 52:1625 54:352 55:1109 56:11 57:294 58:2207 59:1375 60:1188 61:2997 62:3091 63:1741 64:5922 65:2119 66:5888 67:3240 68:1491 69:4136 70:1040 71:627 72:3011 74:2908 75:1512 76:604 77:2763 78:1909 79:1786 80:2298 81:2118 82:3682 83:1470 84:2023 85:3588 86:1104 87:2394 88:1336 89:4609 90:838 91:8401 92:2829 93:2987 94:4168 95:4553 96:1463 97:313 98:953 99:760 100:68 101:1090 102:4257 103:32209 104:5470 105:777 106:912 107:2800 108:1205 109:4224 110:2249 111:3926 112:2758 113:1626 114:2087 115:2211 116:2110 117:3092 118:2554 119:2048 120:2375 121:1554 122:2875 123:2271 124:1665 125:2930 126:125 128:1587 129:971 130:1475 131:2242 132:787 133:461 134:1627 135:365 136:1492 137:1202 138:2856 139:1590 140:1759 141:1561 142:2255 143:2141 144:1325 145:633 146:2188 147:2115 148:2782 149:2846 150:1284 151:2652 152:2269 153:597 154:8162 155:2238 156:3423 157:2193 158:1412 159:2665 160:3661 161:2007 162:3991 163:2326 164:1953 165:2566 166:1322 167:2123 168:3836 169:786 170:5264 171:1091 172:4472 173:3424 174:912 175:1339 176:3765 177:4688 178:4290 179:2288 180:2767 181:4343 182:3798 183:2339 184:2072 185:21668 186:5424 187:4718 188:4386 189:4428 190:9694 191:1528 192:11457 193:9522 194:7850 195:5575 196:3265 197:3247 198:6237 199:6099 200:8205 201:6374 202:10651 203:10497 204:4654 205:3713 206:4409 207:3878 208:4271 209:5390 210:4972 211:2746 212:4914 213:4005 214:1041 215:54 216:7114 217:3333 218:1625 219:575 220:2196 221:1266 222:900 223:3132 End of report

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N96: Call for Content! Last Call for Early Bird Rates
by Nanog News 14 Nov '25

14 Nov '25

*** NANOG 96 Call for Content is OPEN!* ------------------------------------------------------------ *Bring Your Ideas to Life at our Next Conference!* Have an idea that deserves the spotlight? Share your expertise and help shape the next NANOG conference. We are accepting submissions for: * Network Automation - practical uses, how to get started * Kubernetes - implementation and best practices * Future of Networking - forecast for changes in technology, design, applications * Research & Education - what research is happening now in network operations * Security - developments in, problems/solutions, various protocols of * Optical Networking - technology, practice, deployment options * Tutorials - all levels, IPv6, BGP, Segment Routing, DNS, MPLS, VXLAN All topics are encouraged—but this round, we’re especially excited about submissions exploring the intersection of AI + Network Infrastructure. *SUBMIT NOW!* (https://nanog.org/program/call-presentations/) *** Time’s Ticking, Don't Hit Snooze on These Savings!* ------------------------------------------------------------ *Last Call! N96 Registration Rates will Increase After Sunday, Nov.16* Don’t miss your chance to score the Early Bird rate for N96: San Francisco, Feb. 2–4, 2026. Prices increase after Sunday, Nov. 16, so act fast and secure your spot among the brightest minds in networking. Join us where innovation meets connection, register now before rates increase. *REGISTER NOW! *(https://nanog.org/events/nanog-96/registration/registrant) *** Sponsorships are Now Open for N96 + Future Events* ------------------------------------------------------------ *Get Your Brand in Front of the Right Audience* *Available Opportunities:* * Espresso Bar * NANOG Social * Beer 'N' Gear * NANOG Showcase High visibility. High impact. Secure your spot and grow your network. *EMAIL US* (sponsorship(a)nanog.org) *** Stay Connected* ------------------------------------------------------------ http://www.facebook.com http://www.instagram.com/nanog_org/ http://www.linkedin.com/company/nanog/ https://www.twitter.com/nanog/ http://nanog.org

1 0

New c-nsp, j-nsp, a-nsp, etc mailing lists
by Drew Weaver 12 Nov '25

12 Nov '25

I was a big fan of the *-nsp(a)puck.nether.net<mailto:*-nsp@puck.nether.net> mailing lists that now seem to be completely gone without any indication of whether or when they might return. I've been considering just setting up new ones. Please email me off-list if you think this might be useful. Thanks, -Drew

14 24

Artificial Juniper SRX limitations preventing IPv6 deployment (and sales)
by Andrew Kirch 12 Nov '25

12 Nov '25

To those from Juniper, You are actively harming your own sales, and IPv6 deployment. On the SRX3xx line, Junos artificially limits update-router-advertisement to three downstream interfaces. In practice, that means the box will only automatically inject delegated IPv6 prefixes into RAs on three VLANs. This is not a hardware limit. This is not a throughput limit. This is not “the ASIC can’t handle it.” This is an arbitrary cap in software. Here is the operational problem: I have an SRX-340 acquired through Juniper, fully legitimate. It’s being used in my home. I have five VLANs: • management • desktops • servers • iot • guest On IPv4, this is trivial. Each VLAN is routable, each segment is isolated, everyone’s happy. On IPv6, because of this three-interface limit, I can only have automatic prefix delegation and router advertisements on three of those VLANs. After that, Junos just refuses the config. There is no documented way to extend it. There is no warning in the product literature that “this feature stops working at 3.” There is no published technical justification, in fact, I can't find anything published about this limit at all. The result is that I cannot deploy IPv6 cleanly across my entire network using Juniper’s intended/automated method. My choices are: • break my segmentation model to fit an undocumented limit, or • start doing manual RA gymnastics and scripting around Junos just to reach VLAN #4 and VLAN #5. Neither of those is what we should be calling “enterprise-ready IPv6.” It's not even "home-ready IPv6". It's embarrassing. One of the small branches where I installed an SRX-345 has over 40 vlans. We heavily segmented to protect the network from east-west movement, for compliance, and to prevent the spread of ransomware. This is exactly the kind of paper-cut that keeps corporate networks from rolling out IPv6 everywhere. It’s not that IPv6 is “hard.” It’s that Juniper quietly ship artificial restrictions and then make the fix “buy a bigger box that you otherwise don't need.” I for one am not buying it. If this is a licensing/commercial segmentation decision (“branch” products get three VLANs of working IPv6 and if you need more you’re supposed to move up-market and spend tens of thousands more), then please say that, on the record, so operators can plan accordingly (buy from another vendor) and so architects can see what they’re actually buying. If it’s not intentional product gating, then please remove the limit, and provide that to everyone who has bought an SRX-3xx. There is no technical reason an SRX-3xx should only be able to advertise delegated IPv6 prefixes on three VLANs. There are both hardware and software solutions that work as UTM firewalls for branch offices that don't have automatic limits. I am not beholden to Juniper, and I can/will buy other solutions if I have to. That is not helping IPv6 adoption. I opened a jcare ticket on it years ago, and got crickets, so now we're going to see if sunlight is the best disinfectant. I'm not your biggest customer but I've purchased well over $700,000 worth of Juniper gear and jcare. I'm asking that Juniper publicly commit to fixing this, because I assure you I can buy something else. Regards, Andrew Kirch AS401854

34 187

DHCP v6 for IPv4 Delegated prefrefix - Wan IPv6 Only to be routed with RFC8950
by Douglas Fischer 12 Nov '25

12 Nov '25

Trying to stay focused on IPv4 as a Service... I dream of being able to build a backbone that is truly IPv6 Only! But even taking some steps in 464xlat environments, there are still commercial demands that still impose the use of Dual-Stack. This is the case with clients who require (and pay for) a routed IPv4 address. I've been looking for a solution for some time to deliver a routed IPv4 address to the client, and to do so in a way that doesn't depend on exchanging information via email and similar means to let the client know which IPv4 block to use. Note 1: Almost all are business subscribers, and 95% of the time they purchase the delivery of an IPv4 /32 address as a service. In cases where we had access to the device, we frequently used DHCP IPv4 Option 121, pointing the routed block (/32, /31, or even /29) with the next-hop of the route pointing to the same IP address on the subscriber's side of the /30 link network with private IPs. The complex part is that the subscriber's "IT Guy" needs to have a minimum understanding of networking and know that they have to use those IPs as needed. In most cases, this is done in a loopback network, to be used as a VPN endpoint, for NAT... And in very rare cases, routed to the client's internal network to be used as a loopback for servers and similar things. We even developed some JerryRig scripts to retrieve this route information taught via DHCP IPv4 Option 121 and "semi-automate" the use of these IPs in loopbacks in address lists to facilitate client use. But this is only possible on CPEs where scripting is allowed, and even then it's a big challenge to handle multiple NOS on CPEs. My current goal is to find a way to deliver an IPv4 prefix to the subscriber and tell it, "This IPv4 block is delegated to you, and you use it as you see fit... And the default IPv4 route is the same IP as the default IPv6 route." Note2: I tried doing this with the 6PE format 0:0:0:0:0:ffff:IPv4_Block. But I haven't had success with common CPEs. I feel there's a good chance I'm reinventing the wheel. And this is already handled in some DHCPv6 options. And that's precisely why I'm asking my colleagues here if there's already something that can help me. If there isn't... Trying to keep the focus on IPv4 as a Service... Would it be too much to dream of setting something like that up? Note 3: I even considered JerryRiging the JerryRig. That would be a way to "teach via DHCPv6" that these clients have to establish a BGP session over IPv6 with IPv4 and IPv6 Address-Families. But I didn't see that this would help much in putting IPv4 in the loopback of the CPEs. So I left that aside. Any colleagues with suggestions on how to solve this type of problem? P.S.: Unfortunately, my customer base is still far from being able to do without IPv4. And handling things within the client's network IS NOT AN OPTION! Just like "464XLAT 1:1" isn't an option either due to the specific demands of the clients. -- Douglas Fernando Fischer Engº de Controle e Automação

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