IPv4 R&E Routing Table Report 17:05 GMT Mon 23 Feb, 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: 14636 Prefixes after maximum aggregation (per Origin AS): 8708 Deaggregation factor: 1.68 Unique aggregates announced (without unneeded subnets): 9564 Number of IPv4 prefixes with a valid ROA: 6513 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 8122 Total ASes present in the Internet Routing Table: 2256 Prefixes per ASN: 6.49 Origin-only ASes present in the Internet Routing Table: 1962 Origin ASes announcing only one prefix: 906 Transit ASes present in the Internet Routing Table: 294 Transit-only ASes present in the Internet Routing Table: 36 Paths with bogon ASNs present in the IPv4 Routing Table: 2 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: 12 Number of instances of unregistered ASNs: 12 Number of 32-bit ASNs allocated by the RIRs: 48844 Number of 32-bit ASNs visible in the Routing Table: 583 Prefixes from 32-bit ASNs in the Routing Table: 1543 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: 176252064 Equivalent to 10 /8s, 129 /16s and 100 /24s Percentage of available address space announced: 4.8 Percentage of allocated address space announced: 4.8 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: 1480 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3352 Total APNIC prefixes after maximum aggregation: 1708 APNIC Deaggregation factor: 1.96 Prefixes being announced from the APNIC address blocks: 3354 Unique aggregates announced from the APNIC address blocks: 1833 APNIC Region origin ASes present in the Internet Routing Table: 458 APNIC Prefixes per ASN: 7.32 APNIC Region origin ASes announcing only one prefix: 214 APNIC Region transit ASes present in the Internet Routing Table: 42 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: 205 Number of APNIC addresses announced to Internet: 41027136 Equivalent to 2 /8s, 114 /16s and 6 /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: 6741 Total ARIN prefixes after maximum aggregation: 3940 ARIN Deaggregation factor: 1.71 Prefixes being announced from the ARIN address blocks: 6762 Unique aggregates announced from the ARIN address blocks: 4449 ARIN Region origin ASes present in the Internet Routing Table: 1058 ARIN Prefixes per ASN: 6.39 ARIN Region origin ASes announcing only one prefix: 374 ARIN Region transit ASes present in the Internet Routing Table: 126 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: 180 Number of ARIN addresses announced to Internet: 75199200 Equivalent to 4 /8s, 123 /16s and 114 /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: 3215 Total RIPE prefixes after maximum aggregation: 2641 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3193 Unique aggregates announced from the RIPE address blocks: 2706 RIPE Region origin ASes present in the Internet Routing Table: 579 RIPE Prefixes per ASN: 5.51 RIPE Region origin ASes announcing only one prefix: 263 RIPE Region transit ASes present in the Internet Routing Table: 98 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: 145 Number of RIPE addresses announced to Internet: 56289408 Equivalent to 3 /8s, 90 /16s and 232 /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: 873 Total LACNIC prefixes after maximum aggregation: 329 LACNIC Deaggregation factor: 2.65 Prefixes being announced from the LACNIC address blocks: 871 Unique aggregates announced from the LACNIC address blocks: 424 LACNIC Region origin ASes present in the Internet Routing Table: 88 LACNIC Prefixes per ASN: 9.90 LACNIC Region origin ASes announcing only one prefix: 34 LACNIC Region transit ASes present in the Internet Routing Table: 15 Average LACNIC Region AS path length visible: 4.7 Max LACNIC Region AS path length visible: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 33 Number of LACNIC addresses announced to Internet: 3097600 Equivalent to 0 /8s, 47 /16s and 68 /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: 443 Total AfriNIC prefixes after maximum aggregation: 87 AfriNIC Deaggregation factor: 5.09 Prefixes being announced from the AfriNIC address blocks: 454 Unique aggregates announced from the AfriNIC address blocks: 150 AfriNIC Region origin ASes present in the Internet Routing Table: 34 AfriNIC Prefixes per ASN: 13.35 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: 20 Number of AfriNIC addresses announced to Internet: 636416 Equivalent to 0 /8s, 9 /16s and 182 /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 608 2169 463 SINET-AS Research Organization of Informa 7497 454 180 23 CSTNET-AS-AP Computer Network Information 4538 183 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 164 281 111 AARNET-AS-AP Australian Academic and Rese 55824 153 19 21 NKN-CORE-NW NKN Core Network, IN 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 1659 60 954 34 ERX-TANET-ASN1 Taiwan Academic Network TA 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 132524 42 8 9 TIFR-AS Tata Institute of Fundamental Res 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 376 198 162 152 RISQ-AS - Reseau dInformations Scientifiq 5786 196 16 1 UPRENET - University of Puerto Rico, PR 2920 174 34 7 LACOE - Los Angeles County Office of Educ 2152 147 491 96 CENIC-2152 - CENIC, US 18558 140 18 4 NETBLK-RCOEK - Riverside County Office of 81 102 454 34 NCREN - MCNC, US 21976 92 34 14 NJEDGE-NET - NJEDge.Net, Inc., US 270 84 247 34 AS270 - National Aeronautics and Space Ad 237 82 542 48 MERIT-AS-14 - Merit Network Inc., US 1736 79 16 1 MU-AS - Marquette University, 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 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 786 209 1731 188 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 87 26 67 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 64 630 59 FR-RENATER Reseau National de telecommuni 1653 51 150 48 SUNET SUNET Swedish University Network, E 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 286 175 40 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 49 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 51 84 38 Fundacao Carlos Chagas Filho de Amparo a 61468 46 3 21 CEDIA, EC 1251 36 31 27 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 20191 26 16 1 Pontificia Universidad Catolica de Chile, 21612 25 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 28571 17 40 17 UNIVERSIDADE DE SAO PAULO, BR 278 13 32 3 Universidad Nacional Autonoma de Mexico, 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 227 82 3 KENET-AS, KE 2561 68 4 34 EUN, EG 37215 44 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 327700 14 16 1 MoRENet, MZ 30983 12 4 2 MARWAN-AS, MA 37182 10 8 1 TERNET, TZ 37654 9 1 5 RwEdNet-AS, RW 327798 4 0 3 BERNET, BI 37661 3 6 3 NRaE1-AS, NG 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 608 2169 463 SINET-AS Research Organization of Informa 7497 454 180 23 CSTNET-AS-AP Computer Network Information 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 1916 286 175 40 Rede Nacional de Ensino e Pesquisa, BR 36914 227 82 3 KENET-AS, KE 786 209 1731 188 JANET Jisc Services Limited, GB 376 198 162 152 RISQ-AS - Reseau dInformations Scientifiq 5786 196 16 1 UPRENET - University of Puerto Rico, PR 4538 183 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 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 1916 286 246 Rede Nacional de Ensino e Pesquisa, BR 36914 227 224 KENET-AS, KE 5786 196 195 UPRENET - University of Puerto Rico, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 174 167 LACOE - Los Angeles County Office of Education, 18558 140 136 NETBLK-RCOEK - Riverside County Office of Educa 55824 153 132 NKN-CORE-NW NKN Core Network, IN 4538 183 111 ERX-CERNET-BKB China Education and Research Net 21976 92 78 NJEDGE-NET - NJEDge.Net, Inc., 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 - Worcester Polytec 65340 PRIVATE 193.227.57.0/25 8452 TE-AS TE-AS, EG 65340 PRIVATE 193.227.57.128/25 8452 TE-AS TE-AS, EG 396334 UNALLOCATED 205.143.136.0/21 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.136.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.137.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.138.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.139.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.140.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.141.0/24 5078 ONENET-AS-1 - Oklahoma 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 /12:10 /13:18 /14:34 /15:101 /16:1718 /17:344 /18:362 /19:493 /20:644 /21:729 /22:1100 /23:1220 /24:7682 /25:58 /26:77 /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 209 227 KENET-AS, KE 1916 85 286 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 38 44 MAREN, MW 200521 30 51 SEAP-AGE, ES 27609 29 45 USC-UNIVERSITY-HOSPITAL - USC-University Hospital, US 32440 25 44 LONI - Louisiana Board of RegentsLouisiana Optical Network Initiative LONI, US 36794 24 26 META SOLUTIONS PIKETON - META Solutions, US 61468 24 46 CEDIA, EC 22742 20 70 CT-EDU-NET - Connecticut Education Network, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:18 6:5 8:2 12:1 14:96 23:5 24:1 31:1 35:3 37:26 38:4 40:1 41:90 42:14 44:6 45:23 46:4 47:1 49:13 50:2 58:13 59:17 60:6 61:3 62:5 63:32 64:38 65:3 66:28 67:4 68:10 69:12 70:2 72:5 74:20 76:22 77:7 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 98:2 101:5 102:6 103:287 104:75 108:7 109:1 110:1 111:3 114:1 116:7 118:32 119:23 121:17 122:8 123:8 124:42 128:54 129:38 130:102 131:59 132:57 133:157 134:87 136:197 137:53 138:9 139:4 140:30 141:4 142:30 143:18 144:4 145:13 146:123 147:18 148:9 149:11 150:29 151:9 152:98 153:15 154:13 155:40 156:127 157:26 158:27 159:116 160:34 161:30 162:17 163:75 164:10 165:5 167:14 168:13 169:6 170:14 173:5 175:10 177:3 179:6 180:15 182:3 184:6 185:35 186:2 187:8 188:22 190:15 191:3 192:1270 193:299 194:87 195:89 196:9 197:175 198:383 199:234 200:265 201:7 202:343 203:186 204:339 205:112 206:178 207:209 208:24 209:78 210:106 211:1 212:39 213:4 214:1 216:49 217:22 219:6 220:3 222:2 223:6 End of report