IPv4 R&E Routing Table Report 17:05 GMT Sun 16 Nov, 2025 IPv4 BGP Table (R&E) as seen at ASREN. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/ASREN/ Analysis Summary ---------------- BGP routing table entries examined: 12671 Prefixes after maximum aggregation (per Origin AS): 7954 Deaggregation factor: 1.59 Unique aggregates announced (without unneeded subnets): 8787 Number of IPv4 prefixes with a valid ROA: 5493 Number of IPv4 prefixes with an invalid ROA: 2 Number of IPv4 prefixes with no ROA: 7176 Total ASes present in the Internet Routing Table: 1958 Prefixes per ASN: 6.47 Origin-only ASes present in the Internet Routing Table: 1687 Origin ASes announcing only one prefix: 793 Transit ASes present in the Internet Routing Table: 271 Transit-only ASes present in the Internet Routing Table: 41 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.6 Max AS path length visible: 14 Max AS path prepend of ASN ( 30116) 10 Prefixes from unregistered ASNs in the Routing Table: 10 Number of instances of unregistered ASNs: 10 Number of 32-bit ASNs allocated by the RIRs: 48012 Number of 32-bit ASNs visible in the Routing Table: 465 Prefixes from 32-bit ASNs in the Routing Table: 1216 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: 156364704 Equivalent to 9 /8s, 81 /16s and 239 /24s Percentage of available address space announced: 4.2 Percentage of allocated address space announced: 4.2 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: 1295 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3108 Total APNIC prefixes after maximum aggregation: 1648 APNIC Deaggregation factor: 1.89 Prefixes being announced from the APNIC address blocks: 3105 Unique aggregates announced from the APNIC address blocks: 1753 APNIC Region origin ASes present in the Internet Routing Table: 381 APNIC Prefixes per ASN: 8.15 APNIC Region origin ASes announcing only one prefix: 159 APNIC Region transit ASes present in the Internet Routing Table: 40 Average APNIC Region AS path length visible: 4.4 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 141 Number of APNIC addresses announced to Internet: 37534304 Equivalent to 2 /8s, 60 /16s and 186 /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: 5442 Total ARIN prefixes after maximum aggregation: 3325 ARIN Deaggregation factor: 1.64 Prefixes being announced from the ARIN address blocks: 5466 Unique aggregates announced from the ARIN address blocks: 3739 ARIN Region origin ASes present in the Internet Routing Table: 880 ARIN Prefixes per ASN: 6.21 ARIN Region origin ASes announcing only one prefix: 325 ARIN Region transit ASes present in the Internet Routing Table: 113 Average ARIN Region AS path length visible: 5.1 Max ARIN Region AS path length visible: 14 Number of ARIN region 32-bit ASNs visible in the Routing Table: 141 Number of ARIN addresses announced to Internet: 60900800 Equivalent to 3 /8s, 161 /16s and 69 /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: 3161 Total RIPE prefixes after maximum aggregation: 2598 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3149 Unique aggregates announced from the RIPE address blocks: 2675 RIPE Region origin ASes present in the Internet Routing Table: 566 RIPE Prefixes per ASN: 5.56 RIPE Region origin ASes announcing only one prefix: 260 RIPE Region transit ASes present in the Internet Routing Table: 92 Average RIPE Region AS path length visible: 3.8 Max RIPE Region AS path length visible: 12 Number of RIPE region 32-bit ASNs visible in the Routing Table: 139 Number of RIPE addresses announced to Internet: 56370048 Equivalent to 3 /8s, 92 /16s and 35 /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: 486 Total LACNIC prefixes after maximum aggregation: 277 LACNIC Deaggregation factor: 1.75 Prefixes being announced from the LACNIC address blocks: 485 Unique aggregates announced from the LACNIC address blocks: 449 LACNIC Region origin ASes present in the Internet Routing Table: 40 LACNIC Prefixes per ASN: 12.12 LACNIC Region origin ASes announcing only one prefix: 19 LACNIC Region transit ASes present in the Internet Routing Table: 11 Average LACNIC Region AS path length visible: 5.2 Max LACNIC Region AS path length visible: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 12 Number of LACNIC addresses announced to Internet: 795648 Equivalent to 0 /8s, 12 /16s and 36 /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: 464 Total AfriNIC prefixes after maximum aggregation: 104 AfriNIC Deaggregation factor: 4.46 Prefixes being announced from the AfriNIC address blocks: 463 Unique aggregates announced from the AfriNIC address blocks: 168 AfriNIC Region origin ASes present in the Internet Routing Table: 48 AfriNIC Prefixes per ASN: 9.65 AfriNIC Region origin ASes announcing only one prefix: 30 AfriNIC Region transit ASes present in the Internet Routing Table: 8 Average AfriNIC Region AS path length visible: 5.5 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 32 Number of AfriNIC addresses announced to Internet: 761344 Equivalent to 0 /8s, 11 /16s and 158 /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 606 2169 463 SINET-AS Research Organization of Informa 7497 451 180 23 CSTNET-AS-AP Computer Network Information 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 172 4161 83 ERX-CERNET-BKB China Education and Resear 7575 167 281 113 AARNET-AS-AP Australian Academic and Rese 55824 80 8 31 NKN-CORE-NW NKN Core Network, IN 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 9270 34 3 9 APAN-KR-AS National Infomation Society Ag 24361 33 56 17 CNGI-NJ-IX-AS-AP CERNET2 IX at Southeast Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 376 198 162 149 RISQ-AS, CA 5786 198 16 1 UPRENET, PR 2920 173 34 7 LACOE, US 2152 149 492 98 CENIC-2152, US 18558 137 18 4 NETBLK-RCOEK, US 21976 88 34 14 NJEDGE-NET, US 1736 79 16 1 MU-AS, US 3477 75 78 34 NOAA-NWAVE, US 81 73 160 34 NCREN, US 22742 70 37 32 CT-EDU-NET, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 786 213 1739 190 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 1103 99 1503 84 SURFNET-NL SURFnet, The Netherlands, NL 2614 88 26 68 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 77 88 72 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 64 630 59 FR-RENATER Reseau National de telecommuni 200521 58 4 26 SEAP-AGE, ES Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 247 51 126 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 20191 25 2 22 Pontificia Universidad Catolica de Chile, 52888 13 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 28571 12 37 12 UNIVERSIDADE DE SAO PAULO, BR 278 10 9 9 Universidad Nacional Autonoma de Mexico, 28027 8 2 2 Escuela Superior Politecnica del Litoral, 61468 6 1 5 CEDIA, EC 27817 4 1 4 Red Nacional Academica de Tecnologia Avan 262441 4 4 3 Fund. Vale do Taquari de Educ. e Desenvol Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 231 82 3 KENET-AS, KE 2561 68 4 34 EUN, EG 37215 44 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 327700 12 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 327947 6 4 1 KNUST-, GH 37661 4 6 4 NRaE1-AS, NG 327798 4 0 3 BERNET, BI Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 606 2169 463 SINET-AS Research Organization of Informa 7497 451 180 23 CSTNET-AS-AP Computer Network Information 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 1916 247 51 126 Rede Nacional de Ensino e Pesquisa, BR 36914 231 82 3 KENET-AS, KE 786 213 1739 190 JANET Jisc Services Limited, GB 376 198 162 149 RISQ-AS, CA 5786 198 16 1 UPRENET, PR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 173 34 7 LACOE, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 7497 451 428 CSTNET-AS-AP Computer Network Information Cente 36914 231 228 KENET-AS, KE 5786 198 197 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 173 166 LACOE, US 18558 137 133 NETBLK-RCOEK, US 1916 247 121 Rede Nacional de Ensino e Pesquisa, BR 4538 172 89 ERX-CERNET-BKB China Education and Research Net 1736 79 78 MU-AS, US 21976 88 74 NJEDGE-NET, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 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 396334 UNALLOCATED 205.143.143.0/24 5078 ONENET-AS-1, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 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 203.17.179.0/24 Origin: 7575 AARNET-AS-AP Australian Academic and Res 203.17.179.0/24 Transit: 20965 GEANT The GEANT IP Service, NL Complete listing at https://bgp.nsrc.org/REN/ASREN/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 /9:1 /10:1 /11:0 /12:9 /13:15 /14:29 /15:95 /16:1529 /17:274 /18:294 /19:393 /20:529 /21:623 /22:978 /23:1054 /24:6674 /25:51 /26:78 /27:44 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 213 231 KENET-AS, KE 1916 87 247 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 38 44 MAREN, MW 200521 34 58 SEAP-AGE, ES 22742 20 70 CT-EDU-NET, US 36794 19 20 META SOLUTIONS PIKETON, US 3233 18 30 ICI-ROTLD National Institute for Research and Development in Informatics - ICI Bucharest, RO 47623 18 22 IIAP-ASNET-AS, AM 60187 18 39 LGFL-AS, GB Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 5:18 8:2 12:1 14:69 23:4 24:2 31:1 35:1 37:26 38:3 40:1 41:77 42:13 44:5 45:18 46:4 47:1 49:8 58:12 59:17 60:6 61:2 62:5 63:3 64:14 65:3 66:24 67:4 68:1 69:13 70:2 72:5 74:12 76:5 77:3 78:3 79:9 80:5 81:27 82:3 83:4 84:6 85:28 86:1 87:1 89:16 91:34 93:14 94:1 95:1 96:5 98:2 101:2 102:12 103:196 104:70 108:2 109:1 111:3 114:1 116:7 118:33 119:30 121:14 122:8 124:42 128:33 129:36 130:82 131:42 132:16 133:158 134:86 136:197 137:42 138:10 139:3 140:12 141:1 142:28 143:11 144:12 145:12 146:123 147:13 148:9 149:11 150:7 151:8 152:66 153:12 154:14 155:24 156:123 157:4 158:1 159:116 160:29 161:22 162:9 163:73 164:8 165:3 167:7 168:36 169:5 170:12 172:1 173:5 175:13 177:1 179:3 180:12 182:3 184:19 185:35 187:2 188:20 191:2 192:1145 193:294 194:85 195:85 196:5 197:181 198:322 199:194 200:168 202:339 203:187 204:318 205:102 206:135 207:200 208:10 209:67 210:105 211:2 212:42 213:4 216:49 217:23 219:6 222:2 223:6 End of report