IPv4 R&E Routing Table Report 17:05 GMT Mon 21 Jul, 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: 13653 Prefixes after maximum aggregation (per Origin AS): 8185 Deaggregation factor: 1.67 Unique aggregates announced (without unneeded subnets): 9017 Number of IPv4 prefixes with a valid ROA: 5933 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7719 Total ASes present in the Internet Routing Table: 2064 Prefixes per ASN: 6.61 Origin-only ASes present in the Internet Routing Table: 1791 Origin ASes announcing only one prefix: 831 Transit ASes present in the Internet Routing Table: 273 Transit-only ASes present in the Internet Routing Table: 41 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: 32 Number of instances of unregistered ASNs: 32 Number of 32-bit ASNs allocated by the RIRs: 46911 Number of 32-bit ASNs visible in the Routing Table: 524 Prefixes from 32-bit ASNs in the Routing Table: 1345 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: 154550144 Equivalent to 9 /8s, 54 /16s and 63 /24s Percentage of available address space announced: 4.2 Percentage of allocated address space announced: 4.2 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: 1517 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3668 Total APNIC prefixes after maximum aggregation: 1924 APNIC Deaggregation factor: 1.91 Prefixes being announced from the APNIC address blocks: 3667 Unique aggregates announced from the APNIC address blocks: 2219 APNIC Region origin ASes present in the Internet Routing Table: 465 APNIC Prefixes per ASN: 7.89 APNIC Region origin ASes announcing only one prefix: 210 APNIC Region transit ASes present in the Internet Routing Table: 42 Average APNIC Region AS path length visible: 4.5 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: 31364288 Equivalent to 1 /8s, 222 /16s and 148 /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: 5658 Total ARIN prefixes after maximum aggregation: 3360 ARIN Deaggregation factor: 1.68 Prefixes being announced from the ARIN address blocks: 5706 Unique aggregates announced from the ARIN address blocks: 3747 ARIN Region origin ASes present in the Internet Routing Table: 892 ARIN Prefixes per ASN: 6.40 ARIN Region origin ASes announcing only one prefix: 316 ARIN Region transit ASes present in the Internet Routing Table: 117 Average ARIN Region AS path length visible: 5.0 Max ARIN Region AS path length visible: 14 Number of ARIN region 32-bit ASNs visible in the Routing Table: 142 Number of ARIN addresses announced to Internet: 63921760 Equivalent to 3 /8s, 207 /16s and 94 /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: 3148 Total RIPE prefixes after maximum aggregation: 2597 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3136 Unique aggregates announced from the RIPE address blocks: 2644 RIPE Region origin ASes present in the Internet Routing Table: 569 RIPE Prefixes per ASN: 5.51 RIPE Region origin ASes announcing only one prefix: 261 RIPE Region transit ASes present in the Internet Routing Table: 88 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: 134 Number of RIPE addresses announced to Internet: 56377984 Equivalent to 3 /8s, 92 /16s and 66 /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: 664 Total LACNIC prefixes after maximum aggregation: 242 LACNIC Deaggregation factor: 2.74 Prefixes being announced from the LACNIC address blocks: 660 Unique aggregates announced from the LACNIC address blocks: 318 LACNIC Region origin ASes present in the Internet Routing Table: 59 LACNIC Prefixes per ASN: 11.19 LACNIC Region origin ASes announcing only one prefix: 22 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: 2238688 Equivalent to 0 /8s, 34 /16s and 40 /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: 483 Total AfriNIC prefixes after maximum aggregation: 58 AfriNIC Deaggregation factor: 8.33 Prefixes being announced from the AfriNIC address blocks: 482 Unique aggregates announced from the AfriNIC address blocks: 87 AfriNIC Region origin ASes present in the Internet Routing Table: 37 AfriNIC Prefixes per ASN: 13.03 AfriNIC Region origin ASes announcing only one prefix: 22 AfriNIC Region transit ASes present in the Internet Routing Table: 6 Average AfriNIC Region AS path length visible: 6.0 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 23 Number of AfriNIC addresses announced to Internet: 645120 Equivalent to 0 /8s, 9 /16s and 216 /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 607 2169 462 SINET-AS Research Organization of Informa 7497 453 180 23 CSTNET-AS-AP Computer Network Information 1237 193 74 146 KREONET-AS-KR KISTI, KR 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 4538 125 2559 70 ERX-CERNET-BKB China Education and Resear 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 2697 56 4 33 ERX-ERNET-AS Education and Research Netwo 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 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 187 16 1 UPRENET, PR 2920 179 34 7 LACOE, US 376 178 145 138 RISQ-AS, CA 2152 146 491 96 CENIC-2152, US 18558 138 18 4 NETBLK-RCOEK, US 81 102 339 33 NCREN, US 23024 99 7 17 OCDE, US 21976 88 34 14 NJEDGE-NET, US 1736 78 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 786 193 1742 187 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Peering requests: peering@switch.c 1103 97 1503 84 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 59 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 291 172 32 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 52 Red Universitaria Nacional, CL 2715 37 98 26 Fundacao Carlos Chagas Filho de Amparo a 20191 26 16 1 Pontificia Universidad Catolica de Chile, 21612 23 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR 61468 15 1 11 CEDIA, EC 278 14 17 9 Universidad Nacional Autonoma de Mexico, 52888 12 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 2716 9 26 8 Universidade Federal do Rio Grande do Sul 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 338 82 3 KENET-AS, KE 37215 37 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 327947 7 4 1 KNUST-, GH 327798 4 0 3 BERNET, BI 328903 4 0 1 RITER, CI 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 607 2169 462 SINET-AS Research Organization of Informa 7497 453 180 23 CSTNET-AS-AP Computer Network Information 36914 338 82 3 KENET-AS, KE 1916 291 172 32 Rede Nacional de Ensino e Pesquisa, BR 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 786 193 1742 187 JANET Jisc Services Limited, GB 1237 193 74 146 KREONET-AS-KR KISTI, KR 5786 187 16 1 UPRENET, PR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 179 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 453 430 CSTNET-AS-AP Computer Network Information Cente 36914 338 335 KENET-AS, KE 1916 291 259 Rede Nacional de Ensino e Pesquisa, BR 5786 187 186 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 179 172 LACOE, US 18558 138 134 NETBLK-RCOEK, US 55824 148 127 NKN-CORE-NW NKN Core Network, IN 23024 99 82 OCDE, US 1736 78 77 MU-AS, 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 /12:5 /13:7 /14:25 /15:82 /16:1560 /17:280 /18:315 /19:421 /20:593 /21:624 /22:1016 /23:1145 /24:7406 /25:59 /26:81 /27:32 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 320 338 KENET-AS, KE 1916 88 291 Rede Nacional de Ensino e Pesquisa, BR 23024 38 99 OCDE, US 200521 34 59 SEAP-AGE, ES 37215 31 37 MAREN, MW 25977 27 30 HCCS, US 26898 24 64 RESERVED, ZZ 36794 24 26 META SOLUTIONS PIKETON, US 60187 23 48 LGFL-AS, GB 31638 21 21 ASN-LEPIDA, IT Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:16 8:2 12:1 14:93 23:3 24:2 31:1 35:1 37:14 38:4 40:1 41:95 42:13 44:4 45:25 46:5 47:1 49:12 58:10 59:17 60:6 62:5 63:3 64:30 66:19 67:31 68:1 69:9 70:2 72:7 74:16 76:13 77:6 78:3 79:9 80:8 81:26 82:2 83:7 84:6 85:31 87:1 89:10 91:36 93:15 94:2 95:1 96:5 98:2 101:2 102:7 103:294 104:69 108:5 109:1 111:17 114:8 118:33 119:31 121:28 122:8 123:8 124:42 128:31 129:33 130:94 131:53 132:56 133:156 134:99 136:186 137:44 138:10 139:4 140:24 141:2 142:21 143:12 144:22 145:2 146:123 147:16 148:8 149:10 150:15 151:4 152:101 153:13 154:14 155:40 156:129 157:20 158:25 159:116 160:34 161:8 162:15 163:73 164:10 165:3 167:7 168:35 169:6 170:6 173:5 177:2 179:3 180:16 182:1 184:6 185:38 187:6 188:14 190:2 191:2 192:1155 193:250 194:84 195:67 196:10 197:263 198:332 199:191 200:179 201:7 202:363 203:290 204:317 205:80 206:155 207:198 208:48 209:101 210:206 211:3 212:44 213:4 216:53 217:22 218:2 219:7 220:5 222:3 223:5 End of report