IPv4 R&E Routing Table Report 17:05 GMT Sat 10 Oct, 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: 12978 Prefixes after maximum aggregation (per Origin AS): 7979 Deaggregation factor: 1.63 Unique aggregates announced (without unneeded subnets): 8921 Number of IPv4 prefixes with a valid ROA: 6637 Number of IPv4 prefixes with an invalid ROA: 0 Number of IPv4 prefixes with no ROA: 6341 Total ASes present in the Internet Routing Table: 2037 Prefixes per ASN: 6.37 Origin-only ASes present in the Internet Routing Table: 1752 Origin ASes announcing only one prefix: 828 Transit ASes present in the Internet Routing Table: 285 Transit-only ASes present in the Internet Routing Table: 48 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.4 Max AS path length visible: 47 Max AS path prepend of ASN ( 30075) 41 Prefixes from unregistered ASNs in the Routing Table: 1 Number of instances of unregistered ASNs: 1 Number of 32-bit ASNs allocated by the RIRs: 51623 Number of 32-bit ASNs visible in the Routing Table: 533 Prefixes from 32-bit ASNs in the Routing Table: 1349 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: 164721696 Equivalent to 9 /8s, 209 /16s and 116 /24s Percentage of available address space announced: 4.4 Percentage of allocated address space announced: 4.4 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: 1256 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3204 Total APNIC prefixes after maximum aggregation: 1579 APNIC Deaggregation factor: 2.03 Prefixes being announced from the APNIC address blocks: 3206 Unique aggregates announced from the APNIC address blocks: 1814 APNIC Region origin ASes present in the Internet Routing Table: 415 APNIC Prefixes per ASN: 7.73 APNIC Region origin ASes announcing only one prefix: 198 APNIC Region transit ASes present in the Internet Routing Table: 37 Average APNIC Region AS path length visible: 4.0 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 192 Number of APNIC addresses announced to Internet: 40172352 Equivalent to 2 /8s, 100 /16s and 251 /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: 5853 Total ARIN prefixes after maximum aggregation: 3494 ARIN Deaggregation factor: 1.68 Prefixes being announced from the ARIN address blocks: 5866 Unique aggregates announced from the ARIN address blocks: 3881 ARIN Region origin ASes present in the Internet Routing Table: 924 ARIN Prefixes per ASN: 6.35 ARIN Region origin ASes announcing only one prefix: 333 ARIN Region transit ASes present in the Internet Routing Table: 122 Average ARIN Region AS path length visible: 5.1 Max ARIN Region AS path length visible: 47 Number of ARIN region 32-bit ASNs visible in the Routing Table: 159 Number of ARIN addresses announced to Internet: 68070720 Equivalent to 4 /8s, 14 /16s and 173 /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, 393216-404380 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: 3170 Total RIPE prefixes after maximum aggregation: 2569 RIPE Deaggregation factor: 1.23 Prefixes being announced from the RIPE address blocks: 3154 Unique aggregates announced from the RIPE address blocks: 2631 RIPE Region origin ASes present in the Internet Routing Table: 580 RIPE Prefixes per ASN: 5.44 RIPE Region origin ASes announcing only one prefix: 265 RIPE Region transit ASes present in the Internet Routing Table: 95 Average RIPE Region AS path length visible: 3.7 Max RIPE Region AS path length visible: 12 Number of RIPE region 32-bit ASNs visible in the Routing Table: 154 Number of RIPE addresses announced to Internet: 55351680 Equivalent to 3 /8s, 76 /16s and 153 /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 196608-219547 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: 516 Total LACNIC prefixes after maximum aggregation: 251 LACNIC Deaggregation factor: 2.06 Prefixes being announced from the LACNIC address blocks: 512 Unique aggregates announced from the LACNIC address blocks: 444 LACNIC Region origin ASes present in the Internet Routing Table: 38 LACNIC Prefixes per ASN: 13.47 LACNIC Region origin ASes announcing only one prefix: 13 LACNIC Region transit ASes present in the Internet Routing Table: 10 Average LACNIC Region AS path length visible: 4.3 Max LACNIC Region AS path length visible: 9 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 15 Number of LACNIC addresses announced to Internet: 740896 Equivalent to 0 /8s, 11 /16s and 78 /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: 234 Total AfriNIC prefixes after maximum aggregation: 85 AfriNIC Deaggregation factor: 2.75 Prefixes being announced from the AfriNIC address blocks: 238 Unique aggregates announced from the AfriNIC address blocks: 149 AfriNIC Region origin ASes present in the Internet Routing Table: 31 AfriNIC Prefixes per ASN: 7.68 AfriNIC Region origin ASes announcing only one prefix: 19 AfriNIC Region transit ASes present in the Internet Routing Table: 9 Average AfriNIC Region AS path length visible: 3.9 Max AfriNIC Region AS path length visible: 10 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 13 Number of AfriNIC addresses announced to Internet: 383744 Equivalent to 0 /8s, 5 /16s and 219 /24s AfriNIC AS Blocks 36864-37887, 327680-330751 & 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 610 2153 465 SINET-AS Research Organization of Informa 7497 467 212 24 CSTNET-AS-AP Computer Network Information 4538 230 4191 72 ERX-CERNET-BKB China Education and Resear 58647 185 18 2 KAGAWAU-AS Kagawa University, JP 7575 169 281 115 AARNET-AS-AP Australian Academic and Rese 55824 151 19 21 NKN-CORE-NW NKN Core Network, IN 1659 68 719 43 ERX-TANET-ASN1 Taiwan Academic Network TA 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 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 376 196 146 148 RISQ-AS - Reseau dInformations Scientifiq 2920 172 34 7 LACOE - Los Angeles County Office of Educ 5786 167 16 1 UPRENET - University of Puerto Rico, PR 2152 148 491 97 CENIC-2152 - CENIC, US 18558 139 18 4 NETBLK-RCOEK - Riverside County Office of 21976 92 34 14 NJEDGE-NET - NJEDge.Net, Inc., US 10430 90 132 87 WA-K20 - Washington State K-20 Telecommun 81 85 339 39 NCREN - MCNC, US 1736 79 16 1 MU-AS - Marquette University, US 22742 73 40 31 CT-EDU-NET - Connecticut Education Networ 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 680 294 1884 255 DFN Verein zur Foerderung eines Deutschen 786 209 1682 191 JANET Jisc Services Limited, GB 559 117 533 106 SWITCH Switch, Swiss Academic and Researc 1103 99 1758 84 SURFNET-NL SURFnet, The Netherlands, NL 2614 87 26 63 ROEDUNET, RO 137 83 677 77 ASGARR Consortium GARR, IT 1930 78 88 73 RCCN Fundacao para a Ciencia e a Tecnolog 2200 69 623 63 FR-RENATER Reseau National de telecommuni 200521 57 4 27 SEAP-AGE, ES 1653 51 150 50 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 264 52 128 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 49 Red Universitaria Nacional, CL 61468 30 2 18 CEDIA, EC 20191 26 16 1 Pontificia Universidad Catolica de Chile, 52888 7 1 5 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 262212 7 0 3 Escuela Politecnica Nacional, EC 28193 5 5 2 UNIVERSIDADE ESTADUAL DE LONDRINA, BR 61626 5 2 3 UNIVERSIDADE ESTADUAL DE PONTA GROSSA, BR 262742 5 2 1 Fundacao Universidade Federal do ABC - UF 27817 4 0 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 2561 68 4 34 EUN, EG 37215 46 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 36914 22 2 3 KENET-AS, KE 327700 13 16 1 MoRENet, MZ 30983 12 4 2 MARWAN-AS, MA 37654 10 1 6 RwEdNet-AS, RW 37182 6 8 1 TERNET, TZ 37661 6 6 3 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 610 2153 465 SINET-AS Research Organization of Informa 7497 467 212 24 CSTNET-AS-AP Computer Network Information 680 294 1884 255 DFN Verein zur Foerderung eines Deutschen 1916 264 52 128 Rede Nacional de Ensino e Pesquisa, BR 4538 230 4191 72 ERX-CERNET-BKB China Education and Resear 786 209 1682 191 JANET Jisc Services Limited, GB 376 196 146 148 RISQ-AS - Reseau dInformations Scientifiq 58647 185 18 2 KAGAWAU-AS Kagawa University, JP 2920 172 34 7 LACOE - Los Angeles County Office of Educ 7575 169 281 115 AARNET-AS-AP Australian Academic and Rese 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 467 443 CSTNET-AS-AP Computer Network Information Cente 58647 185 183 KAGAWAU-AS Kagawa University, JP 5786 167 166 UPRENET - University of Puerto Rico, PR 2920 172 165 LACOE - Los Angeles County Office of Education, 4538 230 158 ERX-CERNET-BKB China Education and Research Net 1916 264 136 Rede Nacional de Ensino e Pesquisa, BR 18558 139 135 NETBLK-RCOEK - Riverside County Office of Educa 55824 151 130 NKN-CORE-NW NKN Core Network, IN 21976 92 78 NJEDGE-NET - NJEDge.Net, Inc., US 1736 79 78 MU-AS - Marquette University, 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 401367 UNALLOCATED 216.186.25.0/24 10430 WA-K20 - Washington Sta 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 199.233.182.0/24 Origin: 3734 SCCO - Santa Clara County Office of Educ 199.233.182.0/24 Transit: 2152 CENIC-2152 - CENIC, US 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 /14:35 /15:104 /16:1599 /17:274 /18:292 /19:429 /20:515 /21:598 /22:998 /23:1130 /24:6797 /25:57 /26:79 /27:41 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 1916 89 264 Rede Nacional de Ensino e Pesquisa, BR 31638 50 50 ASN-LEPIDA, IT 37215 40 46 MAREN, MW 200521 33 57 SEAP-AGE, ES 27609 29 45 USC-UNIVERSITY-HOSPITAL - USC-University Hospital, US 60187 26 47 LGFL-AS, GB 36794 24 26 META SOLUTIONS PIKETON - META Solutions, US 22742 20 73 CT-EDU-NET - Connecticut Education Network, US 2614 18 87 ROEDUNET, RO 3233 18 30 ICI-ROTLD National Institute for Research and Development in Informatics - ICI Bucharest, RO Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:21 8:2 12:1 14:94 23:11 24:2 31:2 35:3 37:27 38:3 40:1 41:63 42:18 44:8 45:26 46:6 47:1 49:12 50:1 58:12 59:17 60:6 61:3 62:5 63:32 64:20 65:3 66:24 67:4 68:9 69:14 70:3 72:5 74:33 76:18 77:4 78:3 79:6 80:7 81:28 82:3 83:7 84:6 85:26 86:1 87:1 89:17 91:29 92:1 93:17 94:7 95:1 96:5 98:2 101:4 102:3 103:268 104:69 108:4 109:3 110:1 111:3 114:1 116:7 118:32 119:35 121:3 122:8 123:6 124:42 128:52 129:35 130:89 131:44 132:9 133:160 134:89 136:160 137:40 138:11 139:5 140:12 141:6 142:26 143:16 144:2 145:13 146:120 147:16 148:9 149:11 150:36 151:6 152:64 153:18 154:17 155:25 156:124 157:5 158:22 159:111 160:35 161:28 162:10 163:101 164:12 165:6 167:13 168:35 169:6 170:8 172:1 173:5 174:1 177:1 179:5 180:12 184:5 185:42 187:7 188:21 190:17 192:1176 193:284 194:89 195:85 196:11 197:2 198:327 199:176 200:176 202:311 203:180 204:297 205:93 206:146 207:207 208:23 209:66 210:106 211:1 212:42 213:8 216:50 217:23 219:5 222:2 223:16 End of report