IPv4 R&E Routing Table Report 17:05 GMT Tue 25 Nov, 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: 12803 Prefixes after maximum aggregation (per Origin AS): 7934 Deaggregation factor: 1.61 Unique aggregates announced (without unneeded subnets): 8746 Number of IPv4 prefixes with a valid ROA: 5648 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7154 Total ASes present in the Internet Routing Table: 2034 Prefixes per ASN: 6.29 Origin-only ASes present in the Internet Routing Table: 1756 Origin ASes announcing only one prefix: 834 Transit ASes present in the Internet Routing Table: 278 Transit-only ASes present in the Internet Routing Table: 44 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: 48033 Number of 32-bit ASNs visible in the Routing Table: 533 Prefixes from 32-bit ASNs in the Routing Table: 1356 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: 155451680 Equivalent to 9 /8s, 68 /16s and 1 /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: 1277 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3385 Total APNIC prefixes after maximum aggregation: 1766 APNIC Deaggregation factor: 1.92 Prefixes being announced from the APNIC address blocks: 3383 Unique aggregates announced from the APNIC address blocks: 1889 APNIC Region origin ASes present in the Internet Routing Table: 462 APNIC Prefixes per ASN: 7.32 APNIC Region origin ASes announcing only one prefix: 205 APNIC Region transit ASes present in the Internet Routing Table: 44 Average APNIC Region AS path length visible: 4.4 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 206 Number of APNIC addresses announced to Internet: 37763168 Equivalent to 2 /8s, 64 /16s and 56 /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: 5290 Total ARIN prefixes after maximum aggregation: 3196 ARIN Deaggregation factor: 1.66 Prefixes being announced from the ARIN address blocks: 5314 Unique aggregates announced from the ARIN address blocks: 3585 ARIN Region origin ASes present in the Internet Routing Table: 869 ARIN Prefixes per ASN: 6.12 ARIN Region origin ASes announcing only one prefix: 321 ARIN Region transit ASes present in the Internet Routing Table: 115 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: 143 Number of ARIN addresses announced to Internet: 59670400 Equivalent to 3 /8s, 142 /16s and 127 /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: 3159 Total RIPE prefixes after maximum aggregation: 2599 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3147 Unique aggregates announced from the RIPE address blocks: 2670 RIPE Region origin ASes present in the Internet Routing Table: 568 RIPE Prefixes per ASN: 5.54 RIPE Region origin ASes announcing only one prefix: 260 RIPE Region transit ASes present in the Internet Routing Table: 93 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: 140 Number of RIPE addresses announced to Internet: 56331904 Equivalent to 3 /8s, 91 /16s and 142 /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: 500 Total LACNIC prefixes after maximum aggregation: 269 LACNIC Deaggregation factor: 1.86 Prefixes being announced from the LACNIC address blocks: 499 Unique aggregates announced from the LACNIC address blocks: 434 LACNIC Region origin ASes present in the Internet Routing Table: 42 LACNIC Prefixes per ASN: 11.88 LACNIC Region origin ASes announcing only one prefix: 19 LACNIC Region transit ASes present in the Internet Routing Table: 11 Average LACNIC Region AS path length visible: 4.3 Max LACNIC Region AS path length visible: 9 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 13 Number of LACNIC addresses announced to Internet: 938688 Equivalent to 0 /8s, 14 /16s and 82 /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: 459 Total AfriNIC prefixes after maximum aggregation: 102 AfriNIC Deaggregation factor: 4.50 Prefixes being announced from the AfriNIC address blocks: 458 Unique aggregates announced from the AfriNIC address blocks: 166 AfriNIC Region origin ASes present in the Internet Routing Table: 47 AfriNIC Prefixes per ASN: 9.74 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: 31 Number of AfriNIC addresses announced to Internet: 745216 Equivalent to 0 /8s, 11 /16s and 95 /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 596 2169 463 SINET-AS Research Organization of Informa 7497 453 180 23 CSTNET-AS-AP Computer Network Information 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 171 4161 83 ERX-CERNET-BKB China Education and Resear 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 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 5786 198 16 1 UPRENET, PR 2920 176 34 7 LACOE, US 2152 149 492 98 CENIC-2152, US 18558 137 18 4 NETBLK-RCOEK, US 21976 88 34 14 NJEDGE-NET, US 376 79 6 56 RISQ-AS, CA 1736 79 16 1 MU-AS, US 3477 77 79 37 NOAA-NWAVE, US 22742 70 37 32 CT-EDU-NET, US 81 68 149 29 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 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 786 213 1739 190 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 77 88 72 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 55 4 28 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 67 128 Rede Nacional de Ensino e Pesquisa, BR 11340 110 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 14 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 21612 4 0 2 FUNDACAO INSTITUTO OSWALDO CRUZ, 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 230 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 328903 4 0 1 RITER, CI 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 596 2169 463 SINET-AS Research Organization of Informa 7497 453 180 23 CSTNET-AS-AP Computer Network Information 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 1916 247 67 128 Rede Nacional de Ensino e Pesquisa, BR 36914 230 82 3 KENET-AS, KE 786 213 1739 190 JANET Jisc Services Limited, GB 5786 198 16 1 UPRENET, PR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 176 34 7 LACOE, US 4538 171 4161 83 ERX-CERNET-BKB China Education and Resear 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 230 227 KENET-AS, KE 5786 198 197 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE, US 18558 137 133 NETBLK-RCOEK, US 55824 152 131 NKN-CORE-NW NKN Core Network, IN 1916 247 119 Rede Nacional de Ensino e Pesquisa, BR 4538 171 88 ERX-CERNET-BKB China Education and Research Net 1736 79 78 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 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 /16:1514 /17:272 /18:291 /19:397 /20:535 /21:622 /22:991 /23:1083 /24:6774 /25:52 /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 212 230 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 31 55 SEAP-AGE, ES 22742 20 70 CT-EDU-NET, US 36794 19 20 META SOLUTIONS PIKETON, US 3233 18 24 ICI-ROTLD National Institute for Research and Development in Informatics - ICI Bucharest, RO 47623 18 22 IIAP-ASNET-AS, AM 60187 18 39 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 5:18 8:2 12:1 14:95 23:4 24:2 31:1 35:1 37:26 38:3 40:1 41:79 42:13 44:5 45:23 46:4 47:1 49:13 58:12 59:17 60:6 61:2 62:5 63:3 64:14 65:3 66:18 67:4 68:1 69:13 70:2 72:5 74:12 76:6 77:3 78:3 79:9 80:5 81:27 82:3 83:5 84:6 85:28 86:1 87:1 89:16 91:34 93:14 94:2 95:1 96:5 98:2 101:2 102:12 103:287 104:69 108:2 109:1 111:3 114:1 116:7 118:32 119:30 121:16 122:8 123:8 124:42 128:33 129:36 130:82 131:42 132:13 133:158 134:86 136:197 137:42 138:10 139:4 140:28 141:1 142:28 143:11 144:20 145:13 146:123 147:13 148:9 149:11 150:7 151:8 152:66 153:12 154:15 155:25 156:126 157:9 158:28 159:116 160:32 161:22 162:11 163:65 164:8 165:4 167:9 168:13 169:5 170:12 172:1 173:5 175:13 179:3 180:15 182:2 184:8 185:33 186:1 187:2 188:20 191:2 192:1139 193:293 194:83 195:87 196:11 197:179 198:313 199:191 200:170 201:2 202:349 203:189 204:307 205:70 206:114 207:197 208:10 209:67 210:109 211:2 212:41 213:4 216:49 217:22 219:6 220:3 222:2 223:6 End of report