Apologies if this is too naive to ask but is there some detail available about the items listed in the summary? 1) In particular, what exactly is the difference between the "BGP routing table entries examined (292961)" and "Unique aggregates announced to Internet (145391)"? 2) I believe 292961 is the worst case routing table size for any router. If the unique aggregates announced to the Internet is 145391, how does the routing table size anywhere may exceeds this number? Is the word "Internet" the key here? 3) Is aggregation done at a particular router for (i) reducing the table size in that router, or (ii) reducing the number of announced prefixes by that router, or (iii) both? Zartash On Fri, Jul 31, 2009 at 11:12 PM, Routing Analysis Role Account < cscora@apnic.net> wrote:

This is an automated weekly mailing describing the state of the Internet Routing Table as seen from APNIC's router in Japan. Daily listings are sent to bgp-stats@lists.apnic.net

For historical data, please see http://thyme.apnic.net.

If you have any comments please contact Philip Smith <pfs@cisco.com>.

Routing Table Report 04:00 +10GMT Sat 01 Aug, 2009

Report Website: http://thyme.apnic.net Detailed Analysis: http://thyme.apnic.net/current/

Analysis Summary ----------------

BGP routing table entries examined: 292961 Prefixes after maximum aggregation: 138493 Deaggregation factor: 2.12 Unique aggregates announced to Internet: 145391 Total ASes present in the Internet Routing Table: 31852 Prefixes per ASN: 9.20 Origin-only ASes present in the Internet Routing Table: 27681 Origin ASes announcing only one prefix: 13518 Transit ASes present in the Internet Routing Table: 4171 Transit-only ASes present in the Internet Routing Table: 105 Average AS path length visible in the Internet Routing Table: 3.6 Max AS path length visible: 24 Max AS path prepend of ASN (12026) 22 Prefixes from unregistered ASNs in the Routing Table: 456 Unregistered ASNs in the Routing Table: 130 Number of 32-bit ASNs allocated by the RIRs: 220 Prefixes from 32-bit ASNs in the Routing Table: 81 Special use prefixes present in the Routing Table: 0 Prefixes being announced from unallocated address space: 340 Number of addresses announced to Internet: 2082757696 Equivalent to 124 /8s, 36 /16s and 92 /24s Percentage of available address space announced: 56.2 Percentage of allocated address space announced: 65.0 Percentage of available address space allocated: 86.4 Percentage of address space in use by end-sites: 78.5 Total number of prefixes smaller than registry allocations: 140414

APNIC Region Analysis Summary -----------------------------

Prefixes being announced by APNIC Region ASes: 70058 Total APNIC prefixes after maximum aggregation: 24829 APNIC Deaggregation factor: 2.82 Prefixes being announced from the APNIC address blocks: 69476 Unique aggregates announced from the APNIC address blocks: 31605 APNIC Region origin ASes present in the Internet Routing Table: 3717 APNIC Prefixes per ASN: 18.69 APNIC Region origin ASes announcing only one prefix: 1012 APNIC Region transit ASes present in the Internet Routing Table: 579 Average APNIC Region AS path length visible: 3.5 Max APNIC Region AS path length visible: 16 Number of APNIC addresses announced to Internet: 475903680 Equivalent to 28 /8s, 93 /16s and 182 /24s Percentage of available APNIC address space announced: 88.6

APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431 (pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079 APNIC Address Blocks 58/8, 59/8, 60/8, 61/8, 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, 180/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8, 222/8,

ARIN Region Analysis Summary ----------------------------

Prefixes being announced by ARIN Region ASes: 124431 Total ARIN prefixes after maximum aggregation: 66173 ARIN Deaggregation factor: 1.88 Prefixes being announced from the ARIN address blocks: 125090 Unique aggregates announced from the ARIN address blocks: 52293 ARIN Region origin ASes present in the Internet Routing Table: 13139 ARIN Prefixes per ASN: 9.52 ARIN Region origin ASes announcing only one prefix: 5077 ARIN Region transit ASes present in the Internet Routing Table: 1287 Average ARIN Region AS path length visible: 3.3 Max ARIN Region AS path length visible: 24 Number of ARIN addresses announced to Internet: 1012769216 Equivalent to 60 /8s, 93 /16s and 161 /24s Percentage of available ARIN address space announced: 88.8

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 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, 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, 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, 108/8, 173/8, 174/8, 184/8, 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: 67087 Total RIPE prefixes after maximum aggregation: 39643 RIPE Deaggregation factor: 1.69 Prefixes being announced from the RIPE address blocks: 66684 Unique aggregates announced from the RIPE address blocks: 44964 RIPE Region origin ASes present in the Internet Routing Table: 13340 RIPE Prefixes per ASN: 5.00 RIPE Region origin ASes announcing only one prefix: 6980 RIPE Region transit ASes present in the Internet Routing Table: 1995 Average RIPE Region AS path length visible: 4.0 Max RIPE Region AS path length visible: 21 Number of RIPE addresses announced to Internet: 498967744 Equivalent to 29 /8s, 189 /16s and 164 /24s Percentage of available RIPE address space announced: 99.1

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 RIPE Address Blocks 25/8, 51/8, 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, 178/8, 193/8, 194/8, 195/8, 212/8, 213/8, 217/8,

LACNIC Region Analysis Summary ------------------------------

Prefixes being announced by LACNIC Region ASes: 24832 Total LACNIC prefixes after maximum aggregation: 6078 LACNIC Deaggregation factor: 4.09 Prefixes being announced from the LACNIC address blocks: 24789 Unique aggregates announced from the LACNIC address blocks: 13736 LACNIC Region origin ASes present in the Internet Routing Table: 1147 LACNIC Prefixes per ASN: 21.61 LACNIC Region origin ASes announcing only one prefix: 367 LACNIC Region transit ASes present in the Internet Routing Table: 192 Average LACNIC Region AS path length visible: 4.0 Max LACNIC Region AS path length visible: 23 Number of LACNIC addresses announced to Internet: 72874176 Equivalent to 4 /8s, 87 /16s and 248 /24s Percentage of available LACNIC address space announced: 72.4

LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247 plus ERX transfers LACNIC Address Blocks 186/8, 187/8, 189/8, 190/8, 200/8, 201/8,

AfriNIC Region Analysis Summary -------------------------------

Prefixes being announced by AfriNIC Region ASes: 6163 Total AfriNIC prefixes after maximum aggregation: 1482 AfriNIC Deaggregation factor: 4.16 Prefixes being announced from the AfriNIC address blocks: 6569 Unique aggregates announced from the AfriNIC address blocks: 2514 AfriNIC Region origin ASes present in the Internet Routing Table: 299 AfriNIC Prefixes per ASN: 21.97 AfriNIC Region origin ASes announcing only one prefix: 82 AfriNIC Region transit ASes present in the Internet Routing Table: 61 Average AfriNIC Region AS path length visible: 3.8 Max AfriNIC Region AS path length visible: 16 Number of AfriNIC addresses announced to Internet: 20273152 Equivalent to 1 /8s, 53 /16s and 88 /24s Percentage of available AfriNIC address space announced: 60.4

AfriNIC AS Blocks 36864-37887 & ERX transfers AfriNIC Address Blocks 41/8, 197/8,

APNIC Region per AS prefix count summary ----------------------------------------

ASN No of nets /20 equiv MaxAgg Description 4766 1714 6976 419 Korea Telecom (KIX) 17488 1543 137 103 Hathway IP Over Cable Interne 4755 1227 292 145 TATA Communications formerly 9583 1114 87 548 Sify Limited 4134 980 17389 381 CHINANET-BACKBONE 7545 807 198 101 TPG Internet Pty Ltd 9829 807 619 15 BSNL National Internet Backbo 23577 785 34 666 Korea Telecom (ATM-MPLS) 4808 754 1515 172 CNCGROUP IP network: China169 18101 750 201 32 Reliance Infocom Ltd Internet

Complete listing at http://thyme.apnic.net/current/data-ASnet-APNIC

ARIN Region per AS prefix count summary ---------------------------------------

ASN No of nets /20 equiv MaxAgg Description 6389 4224 3643 323 bellsouth.net, inc. 4323 1912 1048 386 Time Warner Telecom 1785 1719 714 138 PaeTec Communications, Inc. 7018 1511 5907 1047 AT&T WorldNet Services 20115 1428 1464 679 Charter Communications 2386 1265 669 921 AT&T Data Communications Serv 6478 1249 274 302 AT&T Worldnet Services 3356 1201 10963 443 Level 3 Communications, LLC 11492 1129 208 12 Cable One 22773 1079 2604 66 Cox Communications, Inc.

Complete listing at http://thyme.apnic.net/current/data-ASnet-ARIN

RIPE Region per AS prefix count summary ---------------------------------------

ASN No of nets /20 equiv MaxAgg Description 30890 483 92 195 Evolva Telecom 12479 470 578 6 Uni2 Autonomous System 3292 460 1905 395 TDC Tele Danmark 702 430 1861 346 UUNET - Commercial IP service 9198 367 138 12 Kazakhtelecom Data Network Ad 3320 353 7083 306 Deutsche Telekom AG 3301 347 1684 310 TeliaNet Sweden 3215 344 3081 109 France Telecom Transpac 8866 335 109 20 Bulgarian Telecommunication C 8551 310 290 38 Bezeq International

Complete listing at http://thyme.apnic.net/current/data-ASnet-RIPE

LACNIC Region per AS prefix count summary -----------------------------------------

ASN No of nets /20 equiv MaxAgg Description 8151 1504 2898 245 UniNet S.A. de C.V. 10620 964 220 107 TVCABLE BOGOTA 28573 637 579 41 NET Servicos de Comunicao S.A 7303 601 320 94 Telecom Argentina Stet-France 22047 539 302 14 VTR PUNTO NET S.A. 11830 489 310 54 Instituto Costarricense de El 11172 443 99 69 Servicios Alestra S.A de C.V 6471 421 96 31 ENTEL CHILE S.A. 7738 410 858 29 Telecomunicacoes da Bahia S.A 3816 386 189 80 Empresa Nacional de Telecomun

Complete listing at http://thyme.apnic.net/current/data-ASnet-LACNIC

AfriNIC Region per AS prefix count summary ------------------------------------------

ASN No of nets /20 equiv MaxAgg Description 8452 1025 188 7 TEDATA 24863 908 90 48 LINKdotNET AS number 20858 324 34 5 EgyNet 3741 277 856 237 The Internet Solution 2018 245 215 143 Tertiary Education Network 6713 176 166 16 Itissalat Al-MAGHRIB 33783 152 10 8 EEPAD TISP TELECOM & INTERNET 24835 138 46 9 RAYA Telecom - Egypt 29571 138 14 6 Ci Telecom Autonomous system 5536 123 8 9 Internet Egypt Network

Complete listing at http://thyme.apnic.net/current/data-ASnet-AFRINIC

Global Per AS prefix count summary ----------------------------------

ASN No of nets /20 equiv MaxAgg Description 6389 4224 3643 323 bellsouth.net, inc. 4323 1912 1048 386 Time Warner Telecom 1785 1719 714 138 PaeTec Communications, Inc. 4766 1714 6976 419 Korea Telecom (KIX) 17488 1543 137 103 Hathway IP Over Cable Interne 7018 1511 5907 1047 AT&T WorldNet Services 8151 1504 2898 245 UniNet S.A. de C.V. 20115 1428 1464 679 Charter Communications 2386 1265 669 921 AT&T Data Communications Serv 6478 1249 274 302 AT&T Worldnet Services

Complete listing at http://thyme.apnic.net/current/data-ASnet

Global Per AS Maximum Aggr summary ----------------------------------

ASN No of nets Net Savings Description 1785 1719 1581 PaeTec Communications, Inc. 4323 1912 1526 Time Warner Telecom 17488 1543 1440 Hathway IP Over Cable Interne 4766 1714 1295 Korea Telecom (KIX) 8151 1504 1259 UniNet S.A. de C.V. 11492 1129 1117 Cable One 4755 1227 1082 TATA Communications formerly 18566 1062 1052 Covad Communications 8452 1025 1018 TEDATA 22773 1079 1013 Cox Communications, Inc.

Complete listing at http://thyme.apnic.net/current/data-CIDRnet

List of Unregistered Origin ASNs (Global) -----------------------------------------

Bad AS Designation Network Transit AS Description 16927 UNALLOCATED 12.0.252.0/23 7018 AT&T WorldNet Servic 15132 UNALLOCATED 12.9.150.0/24 7018 AT&T WorldNet Servic 32567 UNALLOCATED 12.14.170.0/24 7018 AT&T WorldNet Servic 13746 UNALLOCATED 12.24.56.0/24 7018 AT&T WorldNet Servic 32567 UNALLOCATED 12.25.107.0/24 7018 AT&T WorldNet Servic 26973 UNALLOCATED 12.39.152.0/24 7018 AT&T WorldNet Servic 26973 UNALLOCATED 12.39.154.0/23 7018 AT&T WorldNet Servic 26973 UNALLOCATED 12.39.159.0/24 7018 AT&T WorldNet Servic 32326 UNALLOCATED 12.40.49.0/24 7018 AT&T WorldNet Servic 25639 UNALLOCATED 12.41.169.0/24 7018 AT&T WorldNet Servic

Complete listing at http://thyme.apnic.net/current/data-badAS

Advertised Unallocated Addresses --------------------------------

Network Origin AS Description 41.223.92.0/22 36936 >>UNKNOWN<< 41.223.112.0/22 5713 Telkom SA Ltd 41.223.176.0/22 36981 >>UNKNOWN<< 41.223.188.0/24 22351 Intelsat 41.223.189.0/24 26452 Local Communications Networks 62.61.220.0/24 24974 Tachyon Europe BV - Wireless 62.61.221.0/24 24974 Tachyon Europe BV - Wireless 63.140.213.0/24 22555 Universal Talkware Corporatio 63.143.251.0/24 22555 Universal Talkware Corporatio 64.31.32.0/19 11955 ServiceCo LLC - Road Runner

Complete listing at http://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 /8:19 /9:10 /10:24 /11:58 /12:169 /13:350 /14:619 /15:1171 /16:10574 /17:4763 /18:8324 /19:17206 /20:20600 /21:20446 /22:26358 /23:26224 /24:153360 /25:904 /26:1027 /27:574 /28:157 /29:8 /30:7 /31:1 /32:8

Advertised prefixes smaller than registry allocations -----------------------------------------------------

ASN No of nets Total ann. Description 6389 2740 4224 bellsouth.net, inc. 4766 1400 1714 Korea Telecom (KIX) 17488 1290 1543 Hathway IP Over Cable Interne 1785 1189 1719 PaeTec Communications, Inc. 11492 1055 1129 Cable One 18566 1043 1062 Covad Communications 4323 967 1912 Time Warner Telecom 9583 967 1114 Sify Limited 8452 947 1025 TEDATA 10620 872 964 TVCABLE BOGOTA

Complete listing at http://thyme.apnic.net/current/data-sXXas-nos

Number of /24s announced per /8 block (Global) ----------------------------------------------

4:14 8:210 12:2134 13:7 15:19 16:3 17:5 20:35 24:1111 32:52 34:2 38:583 40:98 41:1721 43:1 44:2 47:22 52:6 53:2 55:2 56:2 57:24 58:597 59:649 60:462 61:1081 62:1111 63:2004 64:3704 65:2407 66:3583 67:1680 68:860 69:2731 70:550 71:152 72:1652 73:2 74:1644 75:175 76:340 77:849 78:586 79:355 80:955 81:852 82:591 83:453 84:634 85:1063 86:372 87:670 88:373 89:1479 90:50 91:2425 92:384 93:1090 94:1107 95:1194 96:157 97:240 98:256 99:28 110:168 111:365 112:117 113:147 114:241 115:350 116:1119 117:555 118:338 119:757 120:147 121:782 122:1056 123:685 124:980 125:1377 128:225 129:222 130:128 131:414 132:74 133:10 134:186 135:43 136:224 137:165 138:167 139:82 140:446 141:123 142:384 143:377 144:361 145:48 146:390 147:152 148:529 149:221 150:206 151:193 152:145 153:148 154:2 155:275 156:167 157:301 158:118 159:343 160:289 161:156 162:272 163:165 164:474 165:515 166:466 167:361 168:709 169:176 170:481 171:41 172:10 173:324 174:269 178:1 180:4 186:109 187:145 188:350 189:573 190:2941 192:5790 193:4259 194:3298 195:2692 196:1127 198:3641 199:3363 200:5133 201:1285 202:7740 203:8287 204:3892 205:2135 206:2443 207:2737 208:3893 209:3449 210:2534 211:1106 212:1662 213:1618 214:80 215:29 216:4550 217:1365 218:405 219:450 220:1104 221:479 222:328

End of report