IPv4 R&E Routing Table Report 22:20 GMT Thu 09 Oct, 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: 18981 Prefixes after maximum aggregation (per Origin AS): 10401 Deaggregation factor: 1.82 Unique aggregates announced (without unneeded subnets): 11558 Number of IPv4 prefixes with a valid ROA: 8130 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 10850 Total ASes present in the Internet Routing Table: 2720 Prefixes per ASN: 6.98 Origin-only ASes present in the Internet Routing Table: 2371 Origin ASes announcing only one prefix: 1060 Transit ASes present in the Internet Routing Table: 349 Transit-only ASes present in the Internet Routing Table: 45 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.1 Max AS path length visible: 17 Max AS path prepend of ASN (395156) 12 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: 47652 Number of 32-bit ASNs visible in the Routing Table: 691 Prefixes from 32-bit ASNs in the Routing Table: 1877 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: 167810816 Equivalent to 10 /8s, 0 /16s and 151 /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: 2281 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4678 Total APNIC prefixes after maximum aggregation: 2303 APNIC Deaggregation factor: 2.03 Prefixes being announced from the APNIC address blocks: 4677 Unique aggregates announced from the APNIC address blocks: 2641 APNIC Region origin ASes present in the Internet Routing Table: 578 APNIC Prefixes per ASN: 8.09 APNIC Region origin ASes announcing only one prefix: 238 APNIC Region transit ASes present in the Internet Routing Table: 50 Average APNIC Region AS path length visible: 4.2 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 232 Number of APNIC addresses announced to Internet: 35729664 Equivalent to 2 /8s, 33 /16s and 49 /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: 8408 Total ARIN prefixes after maximum aggregation: 4644 ARIN Deaggregation factor: 1.81 Prefixes being announced from the ARIN address blocks: 8429 Unique aggregates announced from the ARIN address blocks: 5169 ARIN Region origin ASes present in the Internet Routing Table: 1273 ARIN Prefixes per ASN: 6.62 ARIN Region origin ASes announcing only one prefix: 452 ARIN Region transit ASes present in the Internet Routing Table: 154 Average ARIN Region AS path length visible: 4.1 Max ARIN Region AS path length visible: 17 Number of ARIN region 32-bit ASNs visible in the Routing Table: 225 Number of ARIN addresses announced to Internet: 72405504 Equivalent to 4 /8s, 80 /16s and 210 /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: 3545 Total RIPE prefixes after maximum aggregation: 2826 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3536 Unique aggregates announced from the RIPE address blocks: 2918 RIPE Region origin ASes present in the Internet Routing Table: 657 RIPE Prefixes per ASN: 5.38 RIPE Region origin ASes announcing only one prefix: 300 RIPE Region transit ASes present in the Internet Routing Table: 105 Average RIPE Region AS path length visible: 3.7 Max RIPE Region AS path length visible: 13 Number of RIPE region 32-bit ASNs visible in the Routing Table: 155 Number of RIPE addresses announced to Internet: 53347584 Equivalent to 3 /8s, 46 /16s and 5 /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: 1193 Total LACNIC prefixes after maximum aggregation: 462 LACNIC Deaggregation factor: 2.58 Prefixes being announced from the LACNIC address blocks: 1192 Unique aggregates announced from the LACNIC address blocks: 628 LACNIC Region origin ASes present in the Internet Routing Table: 113 LACNIC Prefixes per ASN: 10.55 LACNIC Region origin ASes announcing only one prefix: 42 LACNIC Region transit ASes present in the Internet Routing Table: 21 Average LACNIC Region AS path length visible: 4.3 Max LACNIC Region AS path length visible: 12 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 49 Number of LACNIC addresses announced to Internet: 3853824 Equivalent to 0 /8s, 58 /16s and 206 /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: 1145 Total AfriNIC prefixes after maximum aggregation: 162 AfriNIC Deaggregation factor: 7.07 Prefixes being announced from the AfriNIC address blocks: 1144 Unique aggregates announced from the AfriNIC address blocks: 199 AfriNIC Region origin ASes present in the Internet Routing Table: 50 AfriNIC Prefixes per ASN: 22.88 AfriNIC Region origin ASes announcing only one prefix: 28 AfriNIC Region transit ASes present in the Internet Routing Table: 8 Average AfriNIC Region AS path length visible: 4.9 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 30 Number of AfriNIC addresses announced to Internet: 2471680 Equivalent to 0 /8s, 37 /16s and 183 /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 451 180 23 CSTNET-AS-AP Computer Network Information 1237 195 72 151 KREONET-AS-KR KISTI, KR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 166 281 111 AARNET-AS-AP Australian Academic and Rese 4538 164 2401 79 ERX-CERNET-BKB China Education and Resear 55824 150 19 21 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 23570 59 5 11 INCHEON-AS-KR UNIVERSITY OF INCHEON, KR 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 649 492 100 CENIC-2152, US 2920 230 44 49 LACOE, US 376 200 162 150 RISQ-AS, CA 5786 198 16 1 UPRENET, PR 18558 139 18 5 NETBLK-RCOEK, US 81 127 471 35 NCREN, US 21976 88 34 14 NJEDGE-NET, US 237 83 542 49 MERIT-AS-14, US 1736 79 16 1 MU-AS, US 3477 79 79 37 NOAA-NWAVE, 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 786 213 1742 183 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Switch, Swiss Academic and Researc 8895 108 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 206 178 42 Rede Nacional de Ensino e Pesquisa, BR 28391 159 10 71 Universidad Juarez Autonoma de Tabasco, M 11340 111 25 50 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 19611 49 17 2 Associacao Antonio Vieira - Unisinos, BR 61468 49 3 21 CEDIA, EC 2715 48 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 3596 37 8 4 Universidad Autonoma Metropolitana, MX 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 568 82 3 KENET-AS, KE 2018 376 318 69 TENET-1, ZA 8094 47 48 18 PUKNET, ZA 37215 41 8 1 MAREN, MW 327700 12 16 1 MoRENet, MZ 37501 11 49 6 UOFS, ZA 37654 10 1 6 RwEdNet-AS, RW 36982 8 33 8 UCT, ZA 327947 6 4 1 KNUST-, GH 30983 4 4 1 MARWAN-AS, MA 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 649 492 100 CENIC-2152, US 2907 598 2168 460 SINET-AS Research Organization of Informa 36914 568 82 3 KENET-AS, KE 7497 451 180 23 CSTNET-AS-AP Computer Network Information 2018 376 318 69 TENET-1, ZA 680 282 1883 249 DFN Verein zur Foerderung eines Deutschen 2920 230 44 49 LACOE, US 786 213 1742 183 JANET Jisc Services Limited, GB 1916 206 178 42 Rede Nacional de Ensino e Pesquisa, BR 376 200 162 150 RISQ-AS, CA 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 568 565 KENET-AS, KE 7497 451 428 CSTNET-AS-AP Computer Network Information Cente 2018 376 307 TENET-1, ZA 5786 198 197 UPRENET, PR 2920 230 181 LACOE, US 58647 182 180 KAGAWAU-AS Kagawa University, JP 1916 206 164 Rede Nacional de Ensino e Pesquisa, BR 2907 598 138 SINET-AS Research Organization of Information a 18558 139 134 NETBLK-RCOEK, US 55824 150 129 NKN-CORE-NW NKN Core Network, IN 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 The University 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 /16:1923 /17:424 /18:447 /19:585 /20:834 /21:856 /22:1443 /23:1577 /24:10745 /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 544 568 KENET-AS, KE 8895 105 108 ISU Internet Services Unit ISU, SA 2152 73 649 CENIC-2152, US 31638 48 48 ASN-LEPIDA, IT 3267 35 80 NIKS, RU 37215 35 41 MAREN, MW 28614 32 38 Fundacao Universidade Regional de Blumenau, BR 46115 32 35 LUTHER, US 200521 32 56 SEAP-AGE, ES 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 12:2 14:94 18:39 23:11 24:3 31:1 35:4 37:26 38:13 40:1 41:230 42:18 44:5 45:40 46:4 47:1 49:12 50:4 52:1 58:14 59:18 60:6 61:3 62:6 63:36 64:48 65:21 66:56 67:44 68:19 69:19 70:2 71:1 72:8 74:54 76:28 77:9 78:3 79:9 80:10 81:27 82:6 83:6 84:4 85:48 86:4 87:1 89:16 91:39 92:2 93:13 94:2 95:2 96:5 97:1 98:2 101:3 102:11 103:341 104:74 107:2 108:8 109:8 111:7 114:14 116:7 117:61 118:33 119:30 121:12 122:8 123:8 124:42 125:5 128:57 129:43 130:97 131:65 132:65 133:157 134:111 136:199 137:110 138:10 139:5 140:33 141:4 142:30 143:25 144:45 145:3 146:137 147:27 148:201 149:11 150:36 151:10 152:124 153:14 154:41 155:87 156:128 157:23 158:29 159:117 160:32 161:31 162:29 163:70 164:9 165:43 166:2 167:28 168:103 169:6 170:26 171:1 172:1 173:6 174:1 175:15 177:4 179:9 180:16 182:11 184:4 185:47 186:3 187:22 188:23 190:16 191:13 192:1395 193:272 194:119 195:46 196:148 197:351 198:547 199:250 200:293 201:20 202:620 203:426 204:402 205:185 206:201 207:339 208:39 209:149 210:222 211:4 212:145 213:4 216:88 217:23 218:19 219:6 220:12 222:4 223:6 End of report