IPv4 R&E Routing Table Report 17:05 GMT Fri 06 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: 13416 Prefixes after maximum aggregation (per Origin AS): 8081 Deaggregation factor: 1.66 Unique aggregates announced (without unneeded subnets): 8845 Number of IPv4 prefixes with a valid ROA: 5754 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7661 Total ASes present in the Internet Routing Table: 2062 Prefixes per ASN: 6.51 Origin-only ASes present in the Internet Routing Table: 1786 Origin ASes announcing only one prefix: 825 Transit ASes present in the Internet Routing Table: 276 Transit-only ASes present in the Internet Routing Table: 46 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: 46606 Number of 32-bit ASNs visible in the Routing Table: 510 Prefixes from 32-bit ASNs in the Routing Table: 1285 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: 161139616 Equivalent to 9 /8s, 154 /16s and 203 /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: 1501 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3390 Total APNIC prefixes after maximum aggregation: 1721 APNIC Deaggregation factor: 1.97 Prefixes being announced from the APNIC address blocks: 3389 Unique aggregates announced from the APNIC address blocks: 1864 APNIC Region origin ASes present in the Internet Routing Table: 456 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: 203 Number of APNIC addresses announced to Internet: 36933696 Equivalent to 2 /8s, 51 /16s and 144 /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: 5798 Total ARIN prefixes after maximum aggregation: 3414 ARIN Deaggregation factor: 1.70 Prefixes being announced from the ARIN address blocks: 5846 Unique aggregates announced from the ARIN address blocks: 3825 ARIN Region origin ASes present in the Internet Routing Table: 904 ARIN Prefixes per ASN: 6.47 ARIN Region origin ASes announcing only one prefix: 318 ARIN Region transit ASes present in the Internet Routing Table: 114 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: 136 Number of ARIN addresses announced to Internet: 65842784 Equivalent to 3 /8s, 236 /16s and 174 /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: 3118 Total RIPE prefixes after maximum aggregation: 2589 RIPE Deaggregation factor: 1.20 Prefixes being announced from the RIPE address blocks: 3106 Unique aggregates announced from the RIPE address blocks: 2634 RIPE Region origin ASes present in the Internet Routing Table: 563 RIPE Prefixes per ASN: 5.52 RIPE Region origin ASes announcing only one prefix: 254 RIPE Region transit ASes present in the Internet Routing Table: 89 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: 133 Number of RIPE addresses announced to Internet: 56274048 Equivalent to 3 /8s, 90 /16s and 172 /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: 592 Total LACNIC prefixes after maximum aggregation: 297 LACNIC Deaggregation factor: 1.99 Prefixes being announced from the LACNIC address blocks: 588 Unique aggregates announced from the LACNIC address blocks: 435 LACNIC Region origin ASes present in the Internet Routing Table: 61 LACNIC Prefixes per ASN: 9.64 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: 4.5 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 21 Number of LACNIC addresses announced to Internet: 1388160 Equivalent to 0 /8s, 21 /16s and 46 /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: 486 Total AfriNIC prefixes after maximum aggregation: 56 AfriNIC Deaggregation factor: 8.68 Prefixes being announced from the AfriNIC address blocks: 485 Unique aggregates announced from the AfriNIC address blocks: 85 AfriNIC Region origin ASes present in the Internet Routing Table: 31 AfriNIC Prefixes per ASN: 15.65 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: 5.9 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: 698624 Equivalent to 0 /8s, 10 /16s and 169 /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 581 2104 456 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 171 281 116 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 6262 51 133 45 CSIRO Commonwealth Scientific and Industr 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 45773 48 3 5 HECPERN-AS-PK PERN AS Content Servie Prov 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 376 199 162 149 RISQ-AS, CA 5786 198 16 1 UPRENET, PR 2920 176 34 7 LACOE, US 2152 148 507 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 96 1487 83 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 261 61 112 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 11 1 10 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 346 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 327947 6 2 4 KNUST-, GH 327798 4 0 3 BERNET, BI 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 581 2104 456 SINET-AS Research Organization of Informa 7497 456 180 24 CSTNET-AS-AP Computer Network Information 36914 346 82 3 KENET-AS, KE 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 1916 261 61 112 Rede Nacional de Ensino e Pesquisa, BR 376 199 162 149 RISQ-AS, CA 5786 198 16 1 UPRENET, PR 786 194 1742 187 JANET Jisc Services Limited, GB 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 346 343 KENET-AS, KE 5786 198 197 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE, US 1916 261 149 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 /16:1594 /17:293 /18:302 /19:448 /20:565 /21:593 /22:1015 /23:1097 /24:7195 /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 328 346 KENET-AS, KE 1916 84 261 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 41:99 42:13 44:4 45:24 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 69:10 70:2 72:7 74:17 76:30 77:6 78:3 79:9 80:8 81:9 82:2 83:7 84:6 85:31 87:1 89:10 91:36 93:15 94:2 95:1 96:5 98:2 101:2 102:3 103:299 104:75 108:4 109:1 111:17 114:1 116:6 118:34 119:31 121:28 122:8 123:8 124:42 128:31 129:34 130:95 131:56 132:54 133:155 134:75 136:197 137:47 138:10 139:4 140:26 141:2 142:24 143:12 144:32 145:2 146:123 147:14 148:9 149:12 150:11 151:5 152:78 153:13 154:21 155:38 156:128 157:11 158:27 159:116 160:34 161:12 162:15 163:61 164:10 165:3 167:7 168:12 169:6 170:12 172:1 173:5 177:1 179:10 180:16 182:1 184:7 185:36 187:6 188:13 190:2 191:2 192:1153 193:251 194:85 195:67 196:11 197:265 198:339 199:195 200:176 201:2 202:365 203:187 204:319 205:98 206:160 207:199 208:46 209:94 210:109 211:2 212:42 213:4 216:52 217:22 219:7 222:3 223:6 End of report