IPv4 R&E Routing Table Report 17:05 GMT Wed 18 Mar, 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: 14205 Prefixes after maximum aggregation (per Origin AS): 8448 Deaggregation factor: 1.68 Unique aggregates announced (without unneeded subnets): 9268 Number of IPv4 prefixes with a valid ROA: 6409 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7795 Total ASes present in the Internet Routing Table: 2199 Prefixes per ASN: 6.46 Origin-only ASes present in the Internet Routing Table: 1910 Origin ASes announcing only one prefix: 894 Transit ASes present in the Internet Routing Table: 289 Transit-only ASes present in the Internet Routing Table: 42 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: 2 Number of instances of unregistered ASNs: 2 Number of 32-bit ASNs allocated by the RIRs: 49005 Number of 32-bit ASNs visible in the Routing Table: 565 Prefixes from 32-bit ASNs in the Routing Table: 1437 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: 172609600 Equivalent to 10 /8s, 73 /16s and 208 /24s Percentage of available address space announced: 4.7 Percentage of allocated address space announced: 4.7 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: 1531 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3330 Total APNIC prefixes after maximum aggregation: 1702 APNIC Deaggregation factor: 1.96 Prefixes being announced from the APNIC address blocks: 3331 Unique aggregates announced from the APNIC address blocks: 1817 APNIC Region origin ASes present in the Internet Routing Table: 453 APNIC Prefixes per ASN: 7.35 APNIC Region origin ASes announcing only one prefix: 215 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: 40878144 Equivalent to 2 /8s, 111 /16s and 192 /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: 6432 Total ARIN prefixes after maximum aggregation: 3737 ARIN Deaggregation factor: 1.72 Prefixes being announced from the ARIN address blocks: 6443 Unique aggregates announced from the ARIN address blocks: 4213 ARIN Region origin ASes present in the Internet Routing Table: 1011 ARIN Prefixes per ASN: 6.37 ARIN Region origin ASes announcing only one prefix: 362 ARIN Region transit ASes present in the Internet Routing Table: 123 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: 169 Number of ARIN addresses announced to Internet: 72260256 Equivalent to 4 /8s, 78 /16s and 154 /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: 3193 Total RIPE prefixes after maximum aggregation: 2629 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3178 Unique aggregates announced from the RIPE address blocks: 2700 RIPE Region origin ASes present in the Internet Routing Table: 573 RIPE Prefixes per ASN: 5.55 RIPE Region origin ASes announcing only one prefix: 260 RIPE Region transit ASes present in the Internet Routing Table: 96 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: 144 Number of RIPE addresses announced to Internet: 56236160 Equivalent to 3 /8s, 90 /16s and 24 /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: 722 Total LACNIC prefixes after maximum aggregation: 281 LACNIC Deaggregation factor: 2.57 Prefixes being announced from the LACNIC address blocks: 720 Unique aggregates announced from the LACNIC address blocks: 379 LACNIC Region origin ASes present in the Internet Routing Table: 84 LACNIC Prefixes per ASN: 8.57 LACNIC Region origin ASes announcing only one prefix: 36 LACNIC Region transit ASes present in the Internet Routing Table: 14 Average LACNIC Region AS path length visible: 4.6 Max LACNIC Region AS path length visible: 11 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 29 Number of LACNIC addresses announced to Internet: 2587104 Equivalent to 0 /8s, 39 /16s and 121 /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: 526 Total AfriNIC prefixes after maximum aggregation: 97 AfriNIC Deaggregation factor: 5.42 Prefixes being announced from the AfriNIC address blocks: 531 Unique aggregates announced from the AfriNIC address blocks: 157 AfriNIC Region origin ASes present in the Internet Routing Table: 34 AfriNIC Prefixes per ASN: 15.62 AfriNIC Region origin ASes announcing only one prefix: 21 AfriNIC Region transit ASes present in the Internet Routing Table: 9 Average AfriNIC Region AS path length visible: 5.6 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 18 Number of AfriNIC addresses announced to Internet: 645632 Equivalent to 0 /8s, 9 /16s and 218 /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 606 2153 462 SINET-AS Research Organization of Informa 7497 454 180 23 CSTNET-AS-AP Computer Network Information 4538 182 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 165 281 112 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 1659 59 938 33 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 5786 197 16 1 UPRENET - University of Puerto Rico, PR 2920 173 34 7 LACOE - Los Angeles County Office of Educ 376 163 126 121 RISQ-AS - Reseau dInformations Scientifiq 2152 147 491 96 CENIC-2152 - CENIC, US 18558 140 18 4 NETBLK-RCOEK - Riverside County Office of 21976 92 34 14 NJEDGE-NET - NJEDge.Net, Inc., US 81 83 316 30 NCREN - MCNC, US 237 81 542 48 MERIT-AS-14 - Merit Network Inc., US 1736 79 16 1 MU-AS - Marquette University, US 22742 70 37 32 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 680 291 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 200521 58 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 286 159 41 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 49 Red Universitaria Nacional, CL 2715 49 70 39 Fundacao Carlos Chagas Filho de Amparo a 61468 31 2 20 CEDIA, EC 20191 26 16 1 Pontificia Universidad Catolica de Chile, 21612 18 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 278 13 32 3 Universidad Nacional Autonoma de Mexico, 28027 12 1 7 Escuela Superior Politecnica del Litoral, 2716 11 28 10 Universidade Federal do Rio Grande do Sul 10715 9 18 3 Universidade Federal de Santa Catarina, B 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 316 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 10 1 10 MoRENet, MZ 37182 9 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 606 2153 462 SINET-AS Research Organization of Informa 7497 454 180 23 CSTNET-AS-AP Computer Network Information 36914 316 82 3 KENET-AS, KE 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 1916 286 159 41 Rede Nacional de Ensino e Pesquisa, BR 786 209 1731 188 JANET Jisc Services Limited, GB 5786 197 16 1 UPRENET - University of Puerto Rico, PR 4538 182 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 173 34 7 LACOE - Los Angeles County Office of Educ 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 316 313 KENET-AS, KE 1916 286 245 Rede Nacional de Ensino e Pesquisa, BR 5786 197 196 UPRENET - University of Puerto Rico, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 173 166 LACOE - Los Angeles County Office of Education, 18558 140 136 NETBLK-RCOEK - Riverside County Office of Educa 55824 152 131 NKN-CORE-NW NKN Core Network, IN 4538 182 110 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 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 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 /13:17 /14:34 /15:100 /16:1676 /17:332 /18:352 /19:482 /20:624 /21:700 /22:1064 /23:1189 /24:7445 /25:56 /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 292 316 KENET-AS, KE 1916 86 286 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 38 44 MAREN, MW 32440 34 54 LONI - Louisiana Board of RegentsLouisiana Optical Network Initiative LONI, US 200521 34 58 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 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 14:95 23:5 24:1 31:1 35:3 37:26 38:4 40:1 41:145 42:15 44:6 45:25 46:4 47:1 49:13 50:2 58:13 59:17 60:6 61:3 62:5 63:32 64:37 65:3 66:28 67:4 68:10 69:12 70:2 72:5 74:18 76:28 77:4 78:3 79:5 80:5 81:27 82:3 83:6 84:6 85:26 86:1 87:1 89:17 91:33 93:14 94:2 95:2 96:5 98:2 101:5 102:4 103:279 104:73 108:6 109:2 110:1 111:3 114:1 116:7 118:32 119:26 121:16 122:8 123:8 124:42 128:51 129:37 130:100 131:59 132:53 133:157 134:85 136:191 137:53 138:9 139:4 140:30 141:4 142:25 143:13 144:2 145:3 146:122 147:16 148:8 149:11 150:29 151:9 152:96 153:14 154:14 155:51 156:123 157:20 158:27 159:110 160:33 161:15 162:17 163:75 164:11 165:5 167:14 168:14 169:5 170:13 172:1 173:5 177:2 179:10 180:15 182:1 184:6 185:37 186:2 187:6 188:22 190:10 191:3 192:1247 193:297 194:87 195:87 196:10 197:195 198:349 199:216 200:182 201:5 202:344 203:186 204:333 205:90 206:167 207:198 208:24 209:72 210:107 211:1 212:42 213:4 214:1 216:45 217:22 219:6 222:2 223:6 End of report