IPv4 R&E Routing Table Report 17:05 GMT Sat 03 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: 13147 Prefixes after maximum aggregation (per Origin AS): 8083 Deaggregation factor: 1.63 Unique aggregates announced (without unneeded subnets): 8942 Number of IPv4 prefixes with a valid ROA: 5862 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7284 Total ASes present in the Internet Routing Table: 2078 Prefixes per ASN: 6.33 Origin-only ASes present in the Internet Routing Table: 1799 Origin ASes announcing only one prefix: 860 Transit ASes present in the Internet Routing Table: 279 Transit-only ASes present in the Internet Routing Table: 43 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: 48311 Number of 32-bit ASNs visible in the Routing Table: 546 Prefixes from 32-bit ASNs in the Routing Table: 1391 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: 158018624 Equivalent to 9 /8s, 107 /16s and 44 /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: 1343 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3322 Total APNIC prefixes after maximum aggregation: 1704 APNIC Deaggregation factor: 1.95 Prefixes being announced from the APNIC address blocks: 3320 Unique aggregates announced from the APNIC address blocks: 1829 APNIC Region origin ASes present in the Internet Routing Table: 452 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: 41 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: 37463360 Equivalent to 2 /8s, 59 /16s and 165 /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: 5669 Total ARIN prefixes after maximum aggregation: 3389 ARIN Deaggregation factor: 1.67 Prefixes being announced from the ARIN address blocks: 5696 Unique aggregates announced from the ARIN address blocks: 3823 ARIN Region origin ASes present in the Internet Routing Table: 915 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: 153 Number of ARIN addresses announced to Internet: 62507072 Equivalent to 3 /8s, 185 /16s and 200 /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: 2604 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: 569 RIPE Prefixes per ASN: 5.55 RIPE Region origin ASes announcing only one prefix: 262 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: 12 Number of RIPE region 32-bit ASNs visible in the Routing Table: 142 Number of RIPE addresses announced to Internet: 56366208 Equivalent to 3 /8s, 92 /16s and 20 /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: 517 Total LACNIC prefixes after maximum aggregation: 283 LACNIC Deaggregation factor: 1.83 Prefixes being announced from the LACNIC address blocks: 513 Unique aggregates announced from the LACNIC address blocks: 446 LACNIC Region origin ASes present in the Internet Routing Table: 51 LACNIC Prefixes per ASN: 10.06 LACNIC Region origin ASes announcing only one prefix: 24 LACNIC Region transit ASes present in the Internet Routing Table: 15 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: 920896 Equivalent to 0 /8s, 14 /16s and 13 /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: 457 Total AfriNIC prefixes after maximum aggregation: 101 AfriNIC Deaggregation factor: 4.52 Prefixes being announced from the AfriNIC address blocks: 456 Unique aggregates announced from the AfriNIC address blocks: 162 AfriNIC Region origin ASes present in the Internet Routing Table: 46 AfriNIC Prefixes per ASN: 9.91 AfriNIC Region origin ASes announcing only one prefix: 29 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: 30 Number of AfriNIC addresses announced to Internet: 758784 Equivalent to 0 /8s, 11 /16s and 148 /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 604 2169 464 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 172 4161 83 ERX-CERNET-BKB China Education and Resear 7575 164 281 111 AARNET-AS-AP Australian Academic and Rese 55824 151 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 9270 34 3 9 APAN-KR-AS National Infomation Society Ag 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 376 196 162 148 RISQ-AS, CA 5786 196 16 1 UPRENET, PR 2920 175 34 7 LACOE, US 2152 147 491 96 CENIC-2152, US 18558 140 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 69 165 33 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 680 285 1883 251 DFN Verein zur Foerderung eines Deutschen 786 208 1738 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 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 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 247 51 127 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 18 40 18 UNIVERSIDADE DE SAO PAULO, BR 52888 13 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 278 11 9 10 Universidad Nacional Autonoma de Mexico, 28027 8 2 2 Escuela Superior Politecnica del Litoral, 61468 6 1 5 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 231 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 12 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 327947 5 4 1 KNUST-, GH 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 604 2169 464 SINET-AS Research Organization of Informa 7497 454 180 23 CSTNET-AS-AP Computer Network Information 680 285 1883 251 DFN Verein zur Foerderung eines Deutschen 1916 247 51 127 Rede Nacional de Ensino e Pesquisa, BR 36914 231 82 3 KENET-AS, KE 786 208 1738 186 JANET Jisc Services Limited, GB 376 196 162 148 RISQ-AS, CA 5786 196 16 1 UPRENET, PR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 175 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 231 228 KENET-AS, KE 5786 196 195 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 175 168 LACOE, US 18558 140 136 NETBLK-RCOEK, US 55824 151 130 NKN-CORE-NW NKN Core Network, IN 1916 247 120 Rede Nacional de Ensino e Pesquisa, BR 4538 172 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 /16:1546 /17:293 /18:300 /19:406 /20:543 /21:633 /22:990 /23:1098 /24:7014 /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 213 231 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 33 58 SEAP-AGE, ES 27609 29 45 USC-UNIVERSITY-HOSPITAL, US 22742 20 70 CT-EDU-NET, US 36794 19 20 META SOLUTIONS PIKETON, 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 14:94 23:5 24:1 31:1 35:1 37:26 38:3 40:1 41:85 42:13 44:6 45:23 46:4 47:1 49:13 50:1 58:12 59:17 60:6 61:2 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 91:34 93:14 94:2 95:1 96:5 98:2 101:2 102:8 103:286 104:70 108:2 109:1 111:3 114:1 116:7 118:32 119:31 121:16 122:8 123:8 124:42 128:54 129:36 130:91 131:42 132:18 133:158 134:86 136:195 137:41 138:9 139:4 140:25 141:1 142:28 143:12 144:4 145:13 146:123 147:16 148:9 149:11 150:7 151:8 152:67 153:13 154:14 155:35 156:125 157:6 158:27 159:116 160:33 161:23 162:14 163:73 164:10 165:4 167:9 168:13 169:5 170:13 172:1 173:5 175:4 177:1 179:3 180:15 182:4 184:19 185:35 187:4 188:20 191:2 192:1177 193:295 194:80 195:88 196:11 197:174 198:321 199:198 200:170 201:2 202:339 203:186 204:324 205:104 206:147 207:210 208:11 209:67 210:115 211:2 212:42 213:4 216:48 217:22 219:6 222:2 223:6 End of report