IPv4 R&E Routing Table Report 17:05 GMT Sun 18 Jan, 2026 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: 13105 Prefixes after maximum aggregation (per Origin AS): 8042 Deaggregation factor: 1.63 Unique aggregates announced (without unneeded subnets): 8857 Number of IPv4 prefixes with a valid ROA: 5821 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7283 Total ASes present in the Internet Routing Table: 2061 Prefixes per ASN: 6.36 Origin-only ASes present in the Internet Routing Table: 1783 Origin ASes announcing only one prefix: 852 Transit ASes present in the Internet Routing Table: 278 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: 48432 Number of 32-bit ASNs visible in the Routing Table: 538 Prefixes from 32-bit ASNs in the Routing Table: 1380 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: 2 Number of addresses announced to Internet: 158262080 Equivalent to 9 /8s, 110 /16s and 227 /24s Percentage of available address space announced: 4.3 Percentage of allocated address space announced: 4.3 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: 1360 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3272 Total APNIC prefixes after maximum aggregation: 1692 APNIC Deaggregation factor: 1.93 Prefixes being announced from the APNIC address blocks: 3272 Unique aggregates announced from the APNIC address blocks: 1819 APNIC Region origin ASes present in the Internet Routing Table: 445 APNIC Prefixes per ASN: 7.35 APNIC Region origin ASes announcing only one prefix: 211 APNIC Region transit ASes present in the Internet Routing Table: 40 Average APNIC Region AS path length visible: 4.3 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 203 Number of APNIC addresses announced to Internet: 37446976 Equivalent to 2 /8s, 59 /16s and 101 /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: 5705 Total ARIN prefixes after maximum aggregation: 3382 ARIN Deaggregation factor: 1.69 Prefixes being announced from the ARIN address blocks: 5727 Unique aggregates announced from the ARIN address blocks: 3778 ARIN Region origin ASes present in the Internet Routing Table: 919 ARIN Prefixes per ASN: 6.23 ARIN Region origin ASes announcing only one prefix: 334 ARIN Region transit ASes present in the Internet Routing Table: 117 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: 155 Number of ARIN addresses announced to Internet: 62765632 Equivalent to 3 /8s, 189 /16s and 186 /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: 3172 Total RIPE prefixes after maximum aggregation: 2603 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3160 Unique aggregates announced from the RIPE address blocks: 2680 RIPE Region origin ASes present in the Internet Routing Table: 567 RIPE Prefixes per ASN: 5.57 RIPE Region origin ASes announcing only one prefix: 261 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: 13 Number of RIPE region 32-bit ASNs visible in the Routing Table: 142 Number of RIPE addresses announced to Internet: 56233344 Equivalent to 3 /8s, 90 /16s and 13 /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: 499 Total LACNIC prefixes after maximum aggregation: 271 LACNIC Deaggregation factor: 1.84 Prefixes being announced from the LACNIC address blocks: 498 Unique aggregates announced from the LACNIC address blocks: 425 LACNIC Region origin ASes present in the Internet Routing Table: 50 LACNIC Prefixes per ASN: 9.96 LACNIC Region origin ASes announcing only one prefix: 25 LACNIC Region transit ASes present in the Internet Routing Table: 16 Average LACNIC Region AS path length visible: 4.4 Max LACNIC Region AS path length visible: 9 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 16 Number of LACNIC addresses announced to Internet: 1075520 Equivalent to 0 /8s, 16 /16s and 105 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-275868 + 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: 447 Total AfriNIC prefixes after maximum aggregation: 92 AfriNIC Deaggregation factor: 4.86 Prefixes being announced from the AfriNIC address blocks: 446 Unique aggregates announced from the AfriNIC address blocks: 153 AfriNIC Region origin ASes present in the Internet Routing Table: 37 AfriNIC Prefixes per ASN: 12.05 AfriNIC Region origin ASes announcing only one prefix: 21 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: 22 Number of AfriNIC addresses announced to Internet: 738304 Equivalent to 0 /8s, 11 /16s and 68 /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 454 180 23 CSTNET-AS-AP Computer Network Information 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 173 4161 84 ERX-CERNET-BKB China Education and Resear 7575 164 281 111 AARNET-AS-AP Australian Academic and Rese 55824 152 19 21 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 132524 42 8 9 TIFR-AS Tata Institute of Fundamental Res 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 5786 196 16 1 UPRENET, PR 376 188 161 144 RISQ-AS, CA 2920 176 34 7 LACOE, US 2152 147 491 96 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 21976 92 34 14 NJEDGE-NET, US 1736 79 16 1 MU-AS, US 3477 77 79 37 NOAA-NWAVE, US 22742 70 37 32 CT-EDU-NET, US 81 66 165 30 NCREN, 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 680 284 1883 251 DFN Verein zur Foerderung eines Deutschen 786 210 1738 187 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 78 88 73 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 65 630 60 FR-RENATER Reseau National de telecommuni 200521 59 4 24 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 51 127 Rede Nacional de Ensino e Pesquisa, BR 11340 95 23 45 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 17 40 17 UNIVERSIDADE DE SAO PAULO, BR 52888 14 7 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 278 13 24 8 Universidad Nacional Autonoma de Mexico, 28027 8 2 2 Escuela Superior Politecnica del Litoral, 61468 7 1 6 CEDIA, EC 53046 5 2 3 UNIVERSIDADE ESTADUAL DE PONTA GROSSA, BR 27817 4 1 4 Red Nacional Academica de Tecnologia Avan 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 235 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 11 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 327798 4 0 3 BERNET, BI 37661 3 6 3 NRaE1-AS, NG 327992 3 1 2 GHANAIAN-ACADEMIC-AND-RESEARCH-NETWORK, G 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 454 180 23 CSTNET-AS-AP Computer Network Information 680 284 1883 251 DFN Verein zur Foerderung eines Deutschen 1916 247 51 127 Rede Nacional de Ensino e Pesquisa, BR 36914 235 82 3 KENET-AS, KE 786 210 1738 187 JANET Jisc Services Limited, GB 5786 196 16 1 UPRENET, PR 376 188 161 144 RISQ-AS, CA 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 176 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 454 431 CSTNET-AS-AP Computer Network Information Cente 36914 235 232 KENET-AS, KE 5786 196 195 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE, US 18558 139 135 NETBLK-RCOEK, US 55824 152 131 NKN-CORE-NW NKN Core Network, IN 1916 247 120 Rede Nacional de Ensino e Pesquisa, BR 4538 173 89 ERX-CERNET-BKB China Education and Research Net 21976 92 78 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 Adelaide Unive 203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res 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 /16:1549 /17:298 /18:300 /19:412 /20:544 /21:639 /22:978 /23:1087 /24:6974 /25:52 /26:79 /27:43 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 217 235 KENET-AS, KE 1916 86 247 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 38 44 MAREN, MW 200521 34 59 SEAP-AGE, ES 27609 29 45 USC-UNIVERSITY-HOSPITAL, US 36794 24 26 META SOLUTIONS PIKETON, US 22742 20 70 CT-EDU-NET, US 3233 18 30 ICI-ROTLD National Institute for Research and Development in Informatics - ICI Bucharest, RO 47623 18 22 IIAP-ASNET-AS, AM Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:18 8:2 12:1 14:95 23:5 24:1 31:1 35:1 37:26 38:3 40:1 41:78 42:14 44:6 45:21 46:4 47:1 49:13 58:12 59:17 60:6 61:3 62:5 63:32 64:13 65:3 66:28 67:4 68:9 69:13 70:2 71:1 72:5 74:16 76:10 77:3 78:3 79:9 80:5 81:27 82:3 83:6 84:6 85:26 86:1 87:1 89:16 91:33 93:14 94:2 95:2 96:5 98:2 101:3 102:6 103:276 104:69 108:2 109:2 111:3 114:1 116:7 118:32 119:31 121:16 122:8 123:8 124:42 128:52 129:33 130:91 131:45 132:18 133:157 134:87 136:195 137:42 138:9 139:4 140:25 141:1 142:28 143:12 144:4 145:13 146:109 147:17 148:9 149:11 150:7 151:8 152:67 153:13 154:14 155:35 156:126 157:6 158:27 159:116 160:32 161:23 162:14 163:74 164:10 165:4 167:9 168:13 169:6 170:13 173:5 177:2 179:3 180:15 182:1 184:10 185:35 187:4 188:20 191:2 192:1172 193:294 194:82 195:88 196:11 197:184 198:325 199:201 200:167 201:2 202:337 203:184 204:325 205:102 206:145 207:208 208:19 209:78 210:102 211:1 212:42 213:4 216:48 217:22 219:6 222:2 223:6 End of report