NANOG

Download

nanog@lists.nanog.org

August 2025

157 participants
52 discussions

Source Address Validation (SAV) Deployment and Operational Practices
by Amir Herzberg 04 Aug '25

04 Aug '25

Friends: uRPF and similar SAV techniques have been around for long, with new variants recently/being standardized by the IETF (eFP-uRPF, BAR-SAV). We have done simulations to evaluate the impacts of these variants. To improve our research, we set up a short, quick survey for network managers and administrators of ASNs. In this study, we want to understand the deployment challenges, operational considerations, adoption trends and operator concerns in this area. It would be amazing if you could respond to the survey, available in: https://forms.gle/3rRtCTa2xk217tyd6 We really appreciate your help. The form also contains an option to leave your email for us to send you our research results (paper, simulations, survey). Thanks a lot!! -- Amir Herzberg Comcast professor of Security Innovations, Computer Science and Engineering, University of Connecticut Homepage: https://sites.google.com/site/amirherzberg/home `Applied Introduction to Cryptography and Cybersecurity' textbook: https://sites.google.com/site/amirherzberg/crypto-cyber-book

1 1

Weekly Global IPv4 Routing Table Report
by Routing Table Analysis Role Account 01 Aug '25

01 Aug '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 02 Aug, 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: 993858 Prefixes after maximum aggregation (per Origin AS): 385051 Deaggregation factor: 2.58 Unique aggregates announced (without unneeded subnets): 488585 Number of IPv4 prefixes with a valid ROA: 553671 Number of IPv4 prefixes with an invalid ROA: 1436 Number of IPv4 prefixes with no ROA: 438751 Total ASes present in the Internet Routing Table: 77175 Prefixes per ASN: 12.88 Origin-only ASes present in the Internet Routing Table: 66023 Origin ASes announcing only one prefix: 26963 Transit ASes present in the Internet Routing Table: 11152 Transit-only ASes present in the Internet Routing Table: 565 Average AS path length visible in the Internet Routing Table: 5.2 Max AS path length visible: 59 Max AS path prepend of ASN ( 37447) 54 Prefixes from unregistered ASNs in the Routing Table: 1096 Number of instances of unregistered ASNs: 1139 Number of 32-bit ASNs allocated by the RIRs: 47037 Number of 32-bit ASNs visible in the Routing Table: 38718 Prefixes from 32-bit ASNs in the Routing Table: 207062 Number of bogon 32-bit ASNs visible in the Routing Table: 115 Special use prefixes present in the Routing Table: 1 Prefixes being announced from unallocated address space: 412 Number of addresses announced to Internet: 3108387968 Equivalent to 185 /8s, 70 /16s and 60 /24s Percentage of available address space announced: 84.0 Percentage of allocated address space announced: 84.0 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: 324403 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 264303 Total APNIC prefixes after maximum aggregation: 78870 APNIC Deaggregation factor: 3.35 Prefixes being announced from the APNIC address blocks: 255435 Unique aggregates announced from the APNIC address blocks: 105193 APNIC Region origin ASes present in the Internet Routing Table: 14781 APNIC Prefixes per ASN: 17.28 APNIC Region origin ASes announcing only one prefix: 4524 APNIC Region transit ASes present in the Internet Routing Table: 1977 Average APNIC Region AS path length visible: 5.5 Max APNIC Region AS path length visible: 36 Number of APNIC region 32-bit ASNs visible in the Routing Table: 10290 Number of APNIC addresses announced to Internet: 750210560 Equivalent to 44 /8s, 183 /16s and 78 /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: 292023 Total ARIN prefixes after maximum aggregation: 132368 ARIN Deaggregation factor: 2.21 Prefixes being announced from the ARIN address blocks: 293466 Unique aggregates announced from the ARIN address blocks: 141569 ARIN Region origin ASes present in the Internet Routing Table: 19264 ARIN Prefixes per ASN: 15.23 ARIN Region origin ASes announcing only one prefix: 7040 ARIN Region transit ASes present in the Internet Routing Table: 2000 Average ARIN Region AS path length visible: 4.6 Max ARIN Region AS path length visible: 34 Number of ARIN region 32-bit ASNs visible in the Routing Table: 5272 Number of ARIN addresses announced to Internet: 1349438208 Equivalent to 80 /8s, 110 /16s and 203 /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: 276661 Total RIPE prefixes after maximum aggregation: 136408 RIPE Deaggregation factor: 2.03 Prefixes being announced from the RIPE address blocks: 275592 Unique aggregates announced from the RIPE address blocks: 178225 RIPE Region origin ASes present in the Internet Routing Table: 28977 RIPE Prefixes per ASN: 9.51 RIPE Region origin ASes announcing only one prefix: 12050 RIPE Region transit ASes present in the Internet Routing Table: 4050 Average RIPE Region AS path length visible: 5.2 Max RIPE Region AS path length visible: 49 Number of RIPE region 32-bit ASNs visible in the Routing Table: 12608 Number of RIPE addresses announced to Internet: 732165248 Equivalent to 43 /8s, 163 /16s and 244 /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: 125051 Total LACNIC prefixes after maximum aggregation: 29819 LACNIC Deaggregation factor: 4.19 Prefixes being announced from the LACNIC address blocks: 121402 Unique aggregates announced from the LACNIC address blocks: 49121 LACNIC Region origin ASes present in the Internet Routing Table: 11278 LACNIC Prefixes per ASN: 10.76 LACNIC Region origin ASes announcing only one prefix: 2643 LACNIC Region transit ASes present in the Internet Routing Table: 2556 Average LACNIC Region AS path length visible: 5.9 Max LACNIC Region AS path length visible: 56 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 9240 Number of LACNIC addresses announced to Internet: 171243264 Equivalent to 10 /8s, 52 /16s and 247 /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: 34724 Total AfriNIC prefixes after maximum aggregation: 6856 AfriNIC Deaggregation factor: 5.06 Prefixes being announced from the AfriNIC address blocks: 47551 Unique aggregates announced from the AfriNIC address blocks: 14116 AfriNIC Region origin ASes present in the Internet Routing Table: 1945 AfriNIC Prefixes per ASN: 24.45 AfriNIC Region origin ASes announcing only one prefix: 706 AfriNIC Region transit ASes present in the Internet Routing Table: 378 Average AfriNIC Region AS path length visible: 6.1 Max AfriNIC Region AS path length visible: 59 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 1308 Number of AfriNIC addresses announced to Internet: 105085696 Equivalent to 6 /8s, 67 /16s and 123 /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 12438 8762 118 CHINAMOBILE-CN China Mobile Communication 7545 6136 837 622 TPG-INTERNET-AP TPG Telecom Limited, AU 4538 4812 4192 76 ERX-CERNET-BKB China Education and Resear 9498 4468 536 312 BBIL-AP BHARTI Airtel Ltd., IN 7552 3907 1332 27 VIETEL-AS-AP Viettel Group, VN 7713 3679 1044 66 TELKOMNET-AS-AP PT Telekomunikasi Indones 45899 3299 1869 102 VNPT-AS-VN VNPT Corp, VN 24560 2918 864 512 AIRTELBROADBAND-AS-AP Bharti Airtel Ltd., 56046 2894 812 181 CMNET-JIANGSU-AP China Mobile communicati 4766 2310 11519 606 KIXS-AS-KR Korea Telecom, KR 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 13695 40975 5274 AMAZON-02, US 11492 4826 320 606 CABLEONE, US 7155 3855 286 85 VIASAT-SP-BACKBONE, US 6327 3637 1320 82 SHAW, CA 174 3389 8769 854 COGENT-174, US 22773 3339 3029 165 ASN-CXA-ALL-CCI-22773-RDC, US 749 3222 54766 2473 DNIC-AS-00749, US 396982 3200 3856 434 GOOGLE-CLOUD-PLATFORM, US 16625 2935 1238 2181 AKAMAI-AS, US 4155 2897 220 1734 USDA-1, 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 7579 1711 149 UNI2-AS, ES 39891 4798 293 63 ALJAWWALSTC-AS, SA 20940 3909 3395 127 AKAMAI-ASN1, NL 9009 3838 365 2153 M247, RO 12389 3119 2315 867 ROSTELECOM-AS PJSC Rostelecom. Technical 34984 2404 361 584 TELLCOM-AS, TR 212238 2310 164 1680 CDNEXT, GB 13188 1605 100 37 TRIOLAN, UA 8452 1583 1852 14 TE-AS TE-AS, EG 203020 1520 191 673 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 12320 3272 577 UNINET, MX 10620 3481 473 1037 Telmex Colombia S.A., CO 13999 2520 511 354 Mega Cable, S.A. de C.V., MX 11830 1987 369 64 Instituto Costarricense de Electricidad y 28573 1372 2437 265 Claro NXT Telecomunicacoes Ltda, BR 3816 1351 788 208 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC, 11664 1210 278 33 Techtel LMDS Comunicaciones Interactivas 6147 1187 371 22 Telefonica del Peru S.A.A., PE 22884 1069 68 370 TOTAL PLAY TELECOMUNICACIONES SA DE CV, M 6503 1022 373 162 Axtel, S.A.B. de C.V., MX 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 1725 660 28 RAYA-AS, EG 29571 1604 102 51 ORANGE-COTE-IVOIRE, CI 36992 1413 1492 381 ETISALAT-MISR, EG 36903 1249 554 96 MT-MPLS, MA 24863 1233 389 20 LINKdotNET-AS, EG 37069 1086 1112 11 MOBINIL, EG 36935 914 520 43 Vodafone-, EG 36914 581 82 3 KENET-AS, KE 20011 568 154 212 INTERNET-SOLUTIONS, ZA 15399 544 57 60 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 13695 40975 5274 AMAZON-02, US 9808 12438 8762 118 CHINAMOBILE-CN China Mobile Communication 8151 12320 3272 577 UNINET, MX 12479 7579 1711 149 UNI2-AS, ES 7545 6136 837 622 TPG-INTERNET-AP TPG Telecom Limited, AU 11492 4826 320 606 CABLEONE, US 4538 4812 4192 76 ERX-CERNET-BKB China Education and Resear 39891 4798 293 63 ALJAWWALSTC-AS, SA 9498 4468 536 312 BBIL-AP BHARTI Airtel Ltd., IN 20940 3909 3395 127 AKAMAI-ASN1, NL Complete listing at https://thyme.apnic.net/current/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 9808 12438 12320 CHINAMOBILE-CN China Mobile Communications Grou 8151 12320 11743 UNINET, MX 12479 7579 7430 UNI2-AS, ES 7545 6136 5514 TPG-INTERNET-AP TPG Telecom Limited, AU 4538 4812 4736 ERX-CERNET-BKB China Education and Research Net 39891 4798 4735 ALJAWWALSTC-AS, SA 11492 4826 4220 CABLEONE, US 9498 4468 4156 BBIL-AP BHARTI Airtel Ltd., IN 7552 3907 3880 VIETEL-AS-AP Viettel Group, VN 20940 3909 3782 AKAMAI-ASN1, NL 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 33123 UNALLOCATED 8.10.69.0/24 174 COGENT-174, US 46639 UNALLOCATED 8.17.66.0/24 701 UUNET, US 53775 UNALLOCATED 8.20.88.0/24 7029 WINDSTREAM, US 393266 UNALLOCATED 8.23.52.0/24 46887 CROWNCASTLE-AS46887, US 398074 UNALLOCATED 8.28.115.0/24 32787 PROLEXIC-TECHNOLOGIES-D 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 3356 LEVEL3, US 46639 UNALLOCATED 8.38.73.0/24 3356 LEVEL3, US 395195 UNALLOCATED 8.38.115.0/24 3356 LEVEL3, 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 14.192.20.0/22 Origin: 26658 HENGTONG-IDC-LLC, US 14.192.20.0/22 Transit: 21859 ZEN-ECN, US 23.140.216.0/24 Origin: 27176 DATAWAGON, US 23.140.216.0/24 Transit: 20278 NEXEON, 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 23.147.224.0/24 Origin: 27392 639-DATACENTERS, US 23.147.224.0/24 Transit: 3356 LEVEL3, 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 /11:92 /12:298 /13:579 /14:1200 /15:2132 /16:13806 /17:8294 /18:13580 /19:24798 /20:44795 /21:52265 /22:112503 /23:103063 /24:615589 /25:793 /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 6540 12320 UNINET, MX 12479 6537 7579 UNI2-AS, ES 11492 3618 4826 CABLEONE, US 39891 3489 4798 ALJAWWALSTC-AS, SA 6327 3433 3637 SHAW, CA 7155 2814 3855 VIASAT-SP-BACKBONE, US 22773 2492 3339 ASN-CXA-ALL-CCI-22773-RDC, US 16509 2364 13695 AMAZON-02, US 30036 2291 2632 MEDIACOM-ENTERPRISE-BUSINESS, US 10620 2197 3481 Telmex Colombia S.A., CO Complete listing at https://thyme.apnic.net/current/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1777 2:1498 3:863 4:10 5:4689 6:163 7:6 8:1568 9:2 11:172 12:1338 13:457 14:2620 15:368 16:286 17:378 18:899 20:561 21:4 22:188 23:7743 24:2676 25:2 27:2730 29:19 31:3348 32:38 33:1 34:80 35:262 36:4060 37:4571 38:9487 39:949 40:246 41:4258 42:937 43:2679 44:375 45:18709 46:5072 47:338 49:1905 50:2041 51:592 52:1554 54:325 55:1102 56:11 57:275 58:2105 59:1358 60:1173 61:2891 62:2986 63:1790 64:5542 65:2162 66:4753 67:3092 68:1073 69:3895 70:1046 71:626 72:2859 74:2803 75:1504 76:614 77:2777 78:1895 79:1711 80:2217 81:2052 82:3188 83:1440 84:1907 85:3490 86:1094 87:2380 88:1310 89:4437 90:778 91:8412 92:2719 93:2946 94:4080 95:4407 96:1449 97:311 98:955 99:695 100:71 101:1228 102:3888 103:32245 104:5255 105:802 106:972 107:2656 108:1273 109:4189 110:2237 111:3503 112:2354 113:1579 114:1973 115:2176 116:2078 117:2639 118:2470 119:1962 120:2189 121:1384 122:2808 123:2239 124:1727 125:2909 126:91 128:1600 129:973 130:1305 131:2060 132:784 133:450 134:1596 135:351 136:1468 137:1181 138:2841 139:1599 140:1690 141:1522 142:1907 143:1967 144:1168 145:567 146:2186 147:2099 148:2723 149:2938 150:1277 151:2247 152:2069 153:524 154:7605 155:1851 156:3090 157:1936 158:1358 159:2524 160:3580 161:1896 162:3895 163:2249 164:1877 165:2428 166:1538 167:2014 168:3976 169:784 170:5147 171:999 172:4227 173:3407 174:921 175:1320 176:3732 177:4824 178:3943 179:2346 180:2585 181:4141 182:3547 183:1970 184:2075 185:21601 186:5264 187:4692 188:4265 189:4385 190:9557 191:1504 192:11347 193:9488 194:7785 195:5610 196:3293 197:3197 198:6239 199:8604 200:8246 201:6406 202:10611 203:10613 204:4612 205:3611 206:4513 207:3646 208:4274 209:5189 210:4909 211:2701 212:4564 213:3819 214:1032 215:48 216:6785 217:3263 218:1450 219:568 220:2146 221:1205 222:871 223:2748 End of report

1 0