IPv4 R&E Routing Table Report 17:05 GMT Mon 02 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: 13010 Prefixes after maximum aggregation (per Origin AS): 7994 Deaggregation factor: 1.63 Unique aggregates announced (without unneeded subnets): 8832 Number of IPv4 prefixes with a valid ROA: 5763 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7246 Total ASes present in the Internet Routing Table: 2017 Prefixes per ASN: 6.45 Origin-only ASes present in the Internet Routing Table: 1743 Origin ASes announcing only one prefix: 840 Transit ASes present in the Internet Routing Table: 274 Transit-only ASes present in the Internet Routing Table: 40 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: 48552 Number of 32-bit ASNs visible in the Routing Table: 498 Prefixes from 32-bit ASNs in the Routing Table: 1288 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: 157930688 Equivalent to 9 /8s, 105 /16s and 212 /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: 1354 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3187 Total APNIC prefixes after maximum aggregation: 1643 APNIC Deaggregation factor: 1.94 Prefixes being announced from the APNIC address blocks: 3187 Unique aggregates announced from the APNIC address blocks: 1759 APNIC Region origin ASes present in the Internet Routing Table: 409 APNIC Prefixes per ASN: 7.79 APNIC Region origin ASes announcing only one prefix: 197 APNIC Region transit ASes present in the Internet Routing Table: 37 Average APNIC Region AS path length visible: 4.2 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 170 Number of APNIC addresses announced to Internet: 37297728 Equivalent to 2 /8s, 57 /16s and 30 /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: 5651 Total ARIN prefixes after maximum aggregation: 3366 ARIN Deaggregation factor: 1.68 Prefixes being announced from the ARIN address blocks: 5673 Unique aggregates announced from the ARIN address blocks: 3788 ARIN Region origin ASes present in the Internet Routing Table: 919 ARIN Prefixes per ASN: 6.17 ARIN Region origin ASes announcing only one prefix: 340 ARIN Region transit ASes present in the Internet Routing Table: 119 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: 154 Number of ARIN addresses announced to Internet: 62494400 Equivalent to 3 /8s, 185 /16s and 150 /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: 3183 Total RIPE prefixes after maximum aggregation: 2602 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3171 Unique aggregates announced from the RIPE address blocks: 2677 RIPE Region origin ASes present in the Internet Routing Table: 568 RIPE Prefixes per ASN: 5.58 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: 13 Number of RIPE region 32-bit ASNs visible in the Routing Table: 143 Number of RIPE addresses announced to Internet: 56252032 Equivalent to 3 /8s, 90 /16s and 86 /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: 534 Total LACNIC prefixes after maximum aggregation: 290 LACNIC Deaggregation factor: 1.84 Prefixes being announced from the LACNIC address blocks: 533 Unique aggregates announced from the LACNIC address blocks: 456 LACNIC Region origin ASes present in the Internet Routing Table: 42 LACNIC Prefixes per ASN: 12.69 LACNIC Region origin ASes announcing only one prefix: 20 LACNIC Region transit ASes present in the Internet Routing Table: 13 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: 10 Number of LACNIC addresses announced to Internet: 1164864 Equivalent to 0 /8s, 17 /16s and 198 /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: 445 Total AfriNIC prefixes after maximum aggregation: 91 AfriNIC Deaggregation factor: 4.89 Prefixes being announced from the AfriNIC address blocks: 444 Unique aggregates announced from the AfriNIC address blocks: 150 AfriNIC Region origin ASes present in the Internet Routing Table: 37 AfriNIC Prefixes per ASN: 12.00 AfriNIC Region origin ASes announcing only one prefix: 23 AfriNIC Region transit ASes present in the Internet Routing Table: 9 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: 21 Number of AfriNIC addresses announced to Internet: 719360 Equivalent to 0 /8s, 10 /16s and 250 /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 153 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 197 16 1 UPRENET - University of Puerto Rico, PR 2920 176 34 7 LACOE - Los Angeles County Office of Educ 2152 147 491 96 CENIC-2152 - CENIC, US 376 146 140 110 RISQ-AS - Reseau dInformations Scientifiq 18558 140 18 4 NETBLK-RCOEK - Riverside County Office of 21976 92 34 14 NJEDGE-NET - NJEDge.Net, Inc., US 1736 79 16 1 MU-AS - Marquette University, US 3477 70 78 31 NOAA-NWAVE - National Oceanic and Atmosph 22742 70 37 32 CT-EDU-NET - Connecticut Education Networ 271 64 26 49 BCNET-AS - BCNET, CA 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 786 210 1735 186 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 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 246 51 127 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 1251 30 30 25 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 18 40 17 UNIVERSIDADE DE SAO PAULO, BR 21612 16 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 52888 14 3 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 278 8 8 7 Universidad Nacional Autonoma de Mexico, 28027 7 1 3 Escuela Superior Politecnica del Litoral, 61468 6 1 5 CEDIA, EC 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 327700 14 16 1 MoRENet, MZ 30983 12 4 2 MARWAN-AS, MA 37654 7 0 5 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 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 1916 246 51 127 Rede Nacional de Ensino e Pesquisa, BR 36914 235 82 3 KENET-AS, KE 786 210 1735 186 JANET Jisc Services Limited, GB 5786 197 16 1 UPRENET - University of Puerto Rico, PR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 176 34 7 LACOE - Los Angeles County Office of Educ 4538 173 4161 84 ERX-CERNET-BKB China Education and Resear 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 197 196 UPRENET - University of Puerto Rico, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 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 1916 246 119 Rede Nacional de Ensino e Pesquisa, BR 4538 173 89 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 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 396334 UNALLOCATED 205.143.142.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.143.0/24 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 /12:9 /13:15 /14:29 /15:94 /16:1546 /17:290 /18:292 /19:405 /20:543 /21:634 /22:963 /23:1087 /24:6930 /25:52 /26:76 /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 86 246 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 - USC-University Hospital, US 36794 24 26 META SOLUTIONS PIKETON - META Solutions, US 22742 20 70 CT-EDU-NET - Connecticut Education Network, 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 14:96 23:5 24:1 31:1 35:1 37:26 38:3 40:1 41:80 42:14 44:6 45:17 46:4 47:1 49:13 58:12 59:17 60:6 61:3 62:9 63:32 64:13 65:3 66:28 67:4 68:9 69:10 70:2 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 98:2 101:3 102:6 103:214 104:68 108:2 109:2 111:3 114:1 116:7 118:32 119:23 121:16 122:8 123:8 124:42 128:52 129:33 130:92 131:51 132:16 133:157 134:87 136:196 137:42 138:9 139:4 140:25 141:1 142:30 143:12 144:4 145:13 146:123 147:17 148:9 149:11 150:7 151:8 152:62 153:13 154:11 155:35 156:126 157:16 158:24 159:116 160:31 161:21 162:11 163:75 164:10 165:3 167:16 168:13 169:6 170:12 173:5 177:2 179:3 180:15 184:5 185:33 187:3 188:22 191:2 192:1172 193:291 194:86 195:86 196:11 197:185 198:334 199:202 200:173 201:3 202:338 203:183 204:318 205:88 206:143 207:206 208:20 209:78 210:120 211:1 212:42 213:4 216:48 217:22 219:6 220:3 222:2 223:6 End of report