IPv4 R&E Routing Table Report 22:20 GMT Sun 23 Nov, 2025 IPv4 BGP Table (R&E) as seen at ESnet. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/ESnet/ Analysis Summary ---------------- BGP routing table entries examined: 19149 Prefixes after maximum aggregation (per Origin AS): 10433 Deaggregation factor: 1.84 Unique aggregates announced (without unneeded subnets): 11415 Number of IPv4 prefixes with a valid ROA: 8125 Number of IPv4 prefixes with an invalid ROA: 336 Number of IPv4 prefixes with no ROA: 10688 Total ASes present in the Internet Routing Table: 2705 Prefixes per ASN: 7.08 Origin-only ASes present in the Internet Routing Table: 2356 Origin ASes announcing only one prefix: 1056 Transit ASes present in the Internet Routing Table: 349 Transit-only ASes present in the Internet Routing Table: 43 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 3.9 Max AS path length visible: 27 Max AS path prepend of ASN (200323) 20 Prefixes from unregistered ASNs in the Routing Table: 12 Number of instances of unregistered ASNs: 12 Number of 32-bit ASNs allocated by the RIRs: 48034 Number of 32-bit ASNs visible in the Routing Table: 697 Prefixes from 32-bit ASNs in the Routing Table: 1894 Number of bogon 32-bit ASNs visible in the Routing Table: 0 Special use prefixes present in the Routing Table: 0 Prefixes being announced from unallocated address space: 3 Number of addresses announced to Internet: 167056128 Equivalent to 9 /8s, 245 /16s and 19 /24s Percentage of available address space announced: 4.5 Percentage of allocated address space announced: 4.5 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: 2252 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4599 Total APNIC prefixes after maximum aggregation: 2272 APNIC Deaggregation factor: 2.02 Prefixes being announced from the APNIC address blocks: 4598 Unique aggregates announced from the APNIC address blocks: 2546 APNIC Region origin ASes present in the Internet Routing Table: 574 APNIC Prefixes per ASN: 8.01 APNIC Region origin ASes announcing only one prefix: 236 APNIC Region transit ASes present in the Internet Routing Table: 52 Average APNIC Region AS path length visible: 3.6 Max APNIC Region AS path length visible: 12 Number of APNIC region 32-bit ASNs visible in the Routing Table: 230 Number of APNIC addresses announced to Internet: 35643904 Equivalent to 2 /8s, 31 /16s and 226 /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: 8808 Total ARIN prefixes after maximum aggregation: 4754 ARIN Deaggregation factor: 1.85 Prefixes being announced from the ARIN address blocks: 8829 Unique aggregates announced from the ARIN address blocks: 5184 ARIN Region origin ASes present in the Internet Routing Table: 1269 ARIN Prefixes per ASN: 6.96 ARIN Region origin ASes announcing only one prefix: 451 ARIN Region transit ASes present in the Internet Routing Table: 153 Average ARIN Region AS path length visible: 4.0 Max ARIN Region AS path length visible: 16 Number of ARIN region 32-bit ASNs visible in the Routing Table: 227 Number of ARIN addresses announced to Internet: 72324352 Equivalent to 4 /8s, 79 /16s and 149 /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: 3538 Total RIPE prefixes after maximum aggregation: 2823 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3529 Unique aggregates announced from the RIPE address blocks: 2939 RIPE Region origin ASes present in the Internet Routing Table: 654 RIPE Prefixes per ASN: 5.40 RIPE Region origin ASes announcing only one prefix: 298 RIPE Region transit ASes present in the Internet Routing Table: 106 Average RIPE Region AS path length visible: 3.7 Max RIPE Region AS path length visible: 27 Number of RIPE region 32-bit ASNs visible in the Routing Table: 158 Number of RIPE addresses announced to Internet: 53208576 Equivalent to 3 /8s, 43 /16s and 230 /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: 971 Total LACNIC prefixes after maximum aggregation: 376 LACNIC Deaggregation factor: 2.58 Prefixes being announced from the LACNIC address blocks: 970 Unique aggregates announced from the LACNIC address blocks: 453 LACNIC Region origin ASes present in the Internet Routing Table: 110 LACNIC Prefixes per ASN: 8.82 LACNIC Region origin ASes announcing only one prefix: 44 LACNIC Region transit ASes present in the Internet Routing Table: 15 Average LACNIC Region AS path length visible: 4.0 Max LACNIC Region AS path length visible: 9 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 53 Number of LACNIC addresses announced to Internet: 3389440 Equivalent to 0 /8s, 51 /16s and 184 /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: 1221 Total AfriNIC prefixes after maximum aggregation: 204 AfriNIC Deaggregation factor: 5.99 Prefixes being announced from the AfriNIC address blocks: 1220 Unique aggregates announced from the AfriNIC address blocks: 290 AfriNIC Region origin ASes present in the Internet Routing Table: 51 AfriNIC Prefixes per ASN: 23.92 AfriNIC Region origin ASes announcing only one prefix: 27 AfriNIC Region transit ASes present in the Internet Routing Table: 10 Average AfriNIC Region AS path length visible: 4.8 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 29 Number of AfriNIC addresses announced to Internet: 2487296 Equivalent to 0 /8s, 37 /16s and 244 /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 2907 598 2168 460 SINET-AS Research Organization of Informa 7497 453 180 23 CSTNET-AS-AP Computer Network Information 1237 196 72 151 KREONET-AS-KR KISTI, KR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 165 2403 80 ERX-CERNET-BKB China Education and Resear 7575 162 281 109 AARNET-AS-AP Australian Academic and Rese 55824 150 19 20 NKN-CORE-NW NKN Core Network, IN 4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 1659 57 458 32 ERX-TANET-ASN1 Taiwan Academic Network TA Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 2152 656 492 100 CENIC-2152, US 3477 261 79 37 NOAA-NWAVE, US 2920 229 44 49 LACOE, US 376 200 162 150 RISQ-AS, CA 5786 198 16 1 UPRENET, PR 18558 138 18 5 NETBLK-RCOEK, US 81 118 471 35 NCREN, US 21976 88 34 14 NJEDGE-NET, US 237 84 542 49 MERIT-AS-14, US 1736 79 16 1 MU-AS, US Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 282 1883 249 DFN Verein zur Foerderung eines Deutschen 786 212 1739 189 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 8895 104 24 5 ISU Internet Services Unit ISU, SA 1103 98 1247 83 SURFNET-NL SURFnet, The Netherlands, NL 2614 88 26 68 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 3267 80 29 69 NIKS, RU 1930 77 88 72 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 205 177 41 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 19611 53 17 2 Associacao Antonio Vieira - Unisinos, BR 61468 51 3 21 CEDIA, EC 2715 49 84 36 Fundacao Carlos Chagas Filho de Amparo a 28614 38 2 2 Fundacao Universidade Regional de Blumena 1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 20191 26 16 1 Pontificia Universidad Catolica de Chile, 21612 24 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 555 82 3 KENET-AS, KE 2018 373 318 69 TENET-1, ZA 2561 68 4 34 EUN, EG 8094 47 48 18 PUKNET, ZA 37215 44 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 37501 11 49 6 UOFS, ZA 327700 11 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 36982 8 33 8 UCT, ZA Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2152 656 492 100 CENIC-2152, US 2907 598 2168 460 SINET-AS Research Organization of Informa 36914 555 82 3 KENET-AS, KE 7497 453 180 23 CSTNET-AS-AP Computer Network Information 2018 373 318 69 TENET-1, ZA 680 282 1883 249 DFN Verein zur Foerderung eines Deutschen 3477 261 79 37 NOAA-NWAVE, US 2920 229 44 49 LACOE, US 786 212 1739 189 JANET Jisc Services Limited, GB 1916 205 177 41 Rede Nacional de Ensino e Pesquisa, BR Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 555 552 KENET-AS, KE 7497 453 430 CSTNET-AS-AP Computer Network Information Cente 2018 373 304 TENET-1, ZA 3477 261 224 NOAA-NWAVE, US 5786 198 197 UPRENET, PR 2920 229 180 LACOE, US 58647 182 180 KAGAWAU-AS Kagawa University, JP 1916 205 164 Rede Nacional de Ensino e Pesquisa, BR 2907 598 138 SINET-AS Research Organization of Information a 18558 138 133 NETBLK-RCOEK, US Complete listing at https://bgp.nsrc.org/REN/ESnet/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US 64011 UNALLOCATED 130.215.0.0/16 10326 WPI, US 396334 UNALLOCATED 205.143.136.0/21 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.136.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.137.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.138.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.139.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.140.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.141.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.142.0/24 5078 ONENET-AS-1, US Complete listing at https://bgp.nsrc.org/REN/ESnet/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 162.212.34.0/24 Origin: 54048 CVIN, US 162.212.34.0/24 Transit: 2152 CENIC-2152, US 164.160.192.0/21 Origin: 37661 NRaE1-AS, NG 164.160.192.0/21 Transit: 37288 WACREN, SN 203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP Adelaide Unive 203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res Complete listing at https://bgp.nsrc.org/REN/ESnet/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 /8:0 /9:0 /10:0 /11:0 /12:0 /13:0 /14:33 /15:114 /16:1912 /17:410 /18:448 /19:586 /20:840 /21:872 /22:1458 /23:1611 /24:10865 /25:0 /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 36914 531 555 KENET-AS, KE 8895 101 104 ISU Internet Services Unit ISU, SA 2152 73 656 CENIC-2152, US 31638 48 48 ASN-LEPIDA, IT 37215 38 44 MAREN, MW 3267 35 80 NIKS, RU 200521 34 58 SEAP-AGE, ES 28614 32 38 Fundacao Universidade Regional de Blumenau, BR 46115 32 35 LUTHER, US 25977 30 44 HCCS, US Complete listing at https://bgp.nsrc.org/REN/ESnet/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:16 8:2 12:1 14:94 18:39 23:11 24:3 31:1 35:5 37:26 38:13 40:1 41:225 42:18 44:5 45:41 46:4 47:1 49:13 50:4 52:1 58:14 59:20 60:6 61:3 62:6 63:32 64:49 65:21 66:58 67:43 68:18 69:19 70:2 71:1 72:6 74:54 76:28 77:10 78:3 79:9 80:10 81:27 82:6 83:6 84:5 85:48 86:4 87:1 89:16 91:38 92:2 93:13 94:2 95:2 96:5 97:1 98:2 101:3 102:10 103:342 104:75 108:8 109:8 111:7 113:1 114:22 116:7 117:5 118:32 119:30 121:16 122:8 123:8 124:42 125:5 128:58 129:44 130:98 131:61 132:47 133:157 134:114 136:199 137:121 138:10 139:4 140:146 141:9 142:30 143:25 144:45 145:3 146:137 147:53 148:11 149:11 150:36 151:10 152:115 153:14 154:41 155:122 156:127 157:21 158:29 159:117 160:32 161:94 162:29 163:75 164:9 165:43 166:2 167:28 168:103 169:6 170:19 171:1 172:1 173:6 174:1 175:15 177:5 179:12 180:16 182:11 184:1 185:48 186:3 187:21 188:22 190:16 191:13 192:1395 193:321 194:119 195:92 196:146 197:344 198:581 199:250 200:294 201:20 202:585 203:430 204:409 205:221 206:203 207:344 208:38 209:149 210:222 211:4 212:141 213:4 216:88 217:22 218:19 219:6 220:16 222:4 223:6 End of report