IPv4 R&E Routing Table Report 17:05 GMT Tue 03 Jun, 2025 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: 13333 Prefixes after maximum aggregation (per Origin AS): 8051 Deaggregation factor: 1.66 Unique aggregates announced (without unneeded subnets): 8844 Number of IPv4 prefixes with a valid ROA: 5660 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7672 Total ASes present in the Internet Routing Table: 2063 Prefixes per ASN: 6.46 Origin-only ASes present in the Internet Routing Table: 1784 Origin ASes announcing only one prefix: 827 Transit ASes present in the Internet Routing Table: 279 Transit-only ASes present in the Internet Routing Table: 49 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.5 Max AS path length visible: 20 Max AS path prepend of ASN (327947) 11 Prefixes from unregistered ASNs in the Routing Table: 32 Number of instances of unregistered ASNs: 32 Number of 32-bit ASNs allocated by the RIRs: 46558 Number of 32-bit ASNs visible in the Routing Table: 513 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: 161848288 Equivalent to 9 /8s, 165 /16s and 155 /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: 1426 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3380 Total APNIC prefixes after maximum aggregation: 1700 APNIC Deaggregation factor: 1.99 Prefixes being announced from the APNIC address blocks: 3379 Unique aggregates announced from the APNIC address blocks: 1855 APNIC Region origin ASes present in the Internet Routing Table: 455 APNIC Prefixes per ASN: 7.43 APNIC Region origin ASes announcing only one prefix: 212 APNIC Region transit ASes present in the Internet Routing Table: 42 Average APNIC Region AS path length visible: 4.1 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 204 Number of APNIC addresses announced to Internet: 37247808 Equivalent to 2 /8s, 56 /16s and 91 /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: 5781 Total ARIN prefixes after maximum aggregation: 3403 ARIN Deaggregation factor: 1.70 Prefixes being announced from the ARIN address blocks: 5829 Unique aggregates announced from the ARIN address blocks: 3830 ARIN Region origin ASes present in the Internet Routing Table: 899 ARIN Prefixes per ASN: 6.48 ARIN Region origin ASes announcing only one prefix: 315 ARIN Region transit ASes present in the Internet Routing Table: 115 Average ARIN Region AS path length visible: 5.0 Max ARIN Region AS path length visible: 10 Number of ARIN region 32-bit ASNs visible in the Routing Table: 134 Number of ARIN addresses announced to Internet: 66237792 Equivalent to 3 /8s, 242 /16s and 181 /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: 3122 Total RIPE prefixes after maximum aggregation: 2593 RIPE Deaggregation factor: 1.20 Prefixes being announced from the RIPE address blocks: 3110 Unique aggregates announced from the RIPE address blocks: 2638 RIPE Region origin ASes present in the Internet Routing Table: 567 RIPE Prefixes per ASN: 5.49 RIPE Region origin ASes announcing only one prefix: 258 RIPE Region transit ASes present in the Internet Routing Table: 90 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: 135 Number of RIPE addresses announced to Internet: 56276864 Equivalent to 3 /8s, 90 /16s and 183 /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: 591 Total LACNIC prefixes after maximum aggregation: 295 LACNIC Deaggregation factor: 2.00 Prefixes being announced from the LACNIC address blocks: 587 Unique aggregates announced from the LACNIC address blocks: 436 LACNIC Region origin ASes present in the Internet Routing Table: 61 LACNIC Prefixes per ASN: 9.62 LACNIC Region origin ASes announcing only one prefix: 25 LACNIC Region transit ASes present in the Internet Routing Table: 15 Average LACNIC Region AS path length visible: 4.5 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 23 Number of LACNIC addresses announced to Internet: 1387968 Equivalent to 0 /8s, 21 /16s and 45 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-274844 + 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: 427 Total AfriNIC prefixes after maximum aggregation: 56 AfriNIC Deaggregation factor: 7.62 Prefixes being announced from the AfriNIC address blocks: 426 Unique aggregates announced from the AfriNIC address blocks: 83 AfriNIC Region origin ASes present in the Internet Routing Table: 31 AfriNIC Prefixes per ASN: 13.74 AfriNIC Region origin ASes announcing only one prefix: 17 AfriNIC Region transit ASes present in the Internet Routing Table: 8 Average AfriNIC Region AS path length visible: 6.0 Max AfriNIC Region AS path length visible: 20 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 17 Number of AfriNIC addresses announced to Internet: 695552 Equivalent to 0 /8s, 10 /16s and 157 /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 601 2170 465 SINET-AS Research Organization of Informa 7497 456 180 24 CSTNET-AS-AP Computer Network Information 4538 190 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 173 281 117 AARNET-AS-AP Australian Academic and Rese 55824 148 19 21 NKN-CORE-NW NKN Core Network, IN 2697 58 4 34 ERX-ERNET-AS Education and Research Netwo 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 45773 48 3 5 HECPERN-AS-PK PERN AS Content Servie Prov 132524 42 9 10 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 199 16 1 UPRENET, PR 376 191 161 142 RISQ-AS, CA 2920 176 34 7 LACOE, US 2152 147 507 97 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 81 100 367 27 NCREN, US 23024 99 7 17 OCDE, US 21976 88 34 14 NJEDGE-NET, US 1736 79 16 1 MU-AS, US 22742 67 37 32 CT-EDU-NET, 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 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 786 194 1742 187 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Peering requests: peering@switch.c 1103 95 1471 82 SURFNET-NL SURFnet, The Netherlands, NL 2614 92 26 69 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 63 614 58 FR-RENATER Reseau National de telecommuni 200521 56 4 23 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 262 61 111 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 52 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR 52888 14 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 61468 12 1 11 CEDIA, EC 278 10 9 8 Universidad Nacional Autonoma de Mexico, 10715 9 18 3 Universidade Federal de Santa Catarina, B 21612 9 1 8 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 262742 8 2 1 Fundacao Universidade Federal do ABC - UF 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 289 82 3 KENET-AS, KE 37215 36 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 327700 11 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 37661 9 6 3 NRaE1-AS, NG 327798 4 0 3 BERNET, BI 327947 4 1 4 KNUST-, GH 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 601 2170 465 SINET-AS Research Organization of Informa 7497 456 180 24 CSTNET-AS-AP Computer Network Information 36914 289 82 3 KENET-AS, KE 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 1916 262 61 111 Rede Nacional de Ensino e Pesquisa, BR 5786 199 16 1 UPRENET, PR 786 194 1742 187 JANET Jisc Services Limited, GB 376 191 161 142 RISQ-AS, CA 4538 190 4192 71 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 456 432 CSTNET-AS-AP Computer Network Information Cente 36914 289 286 KENET-AS, KE 5786 199 198 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE, US 1916 262 151 Rede Nacional de Ensino e Pesquisa, BR 18558 139 135 NETBLK-RCOEK, US 55824 148 127 NKN-CORE-NW NKN Core Network, IN 4538 190 119 ERX-CERNET-BKB China Education and Research Net 23024 99 82 OCDE, 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 26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.82.0/24 3112 OARNET-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 The University 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 /13:16 /14:30 /15:99 /16:1605 /17:298 /18:307 /19:445 /20:564 /21:591 /22:1007 /23:1079 /24:7123 /25:51 /26:77 /27:30 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 271 289 KENET-AS, KE 1916 85 262 Rede Nacional de Ensino e Pesquisa, BR 23024 38 99 OCDE, US 200521 31 56 SEAP-AGE, ES 37215 30 36 MAREN, MW 32440 28 51 LONI, US 25977 27 30 HCCS, US 26898 24 64 RESERVED, ZZ 36794 24 26 META SOLUTIONS PIKETON, US 60187 23 48 LGFL-AS, GB Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:16 8:2 12:1 14:93 23:4 24:2 31:1 35:1 37:9 38:4 40:1 41:67 42:13 44:4 45:25 46:5 47:1 49:12 58:16 59:17 60:6 61:2 62:5 63:3 64:30 66:19 67:31 68:2 69:8 70:2 72:7 74:16 76:30 77:6 78:3 79:9 80:8 81:9 82:3 83:7 84:6 85:31 87:1 89:10 91:36 93:15 94:2 95:2 96:5 98:2 101:2 102:3 103:297 104:75 108:4 109:1 111:17 114:1 116:6 118:34 119:31 121:28 122:8 123:8 124:42 128:31 129:35 130:95 131:53 132:54 133:156 134:75 136:198 137:47 138:10 139:4 140:22 141:2 142:24 143:14 144:32 145:2 146:123 147:14 148:9 149:12 150:11 151:5 152:78 153:13 154:21 155:38 156:128 157:11 158:27 159:116 160:34 161:12 162:17 163:61 164:10 165:2 167:7 168:12 169:6 170:12 172:1 173:5 177:1 179:10 180:16 182:1 184:7 185:36 187:7 188:13 190:1 191:2 192:1141 193:251 194:85 195:67 196:11 197:241 198:337 199:194 200:176 201:2 202:371 203:186 204:315 205:98 206:160 207:200 208:46 209:94 210:109 211:2 212:42 213:4 216:52 217:22 219:7 222:3 223:6 End of report