IPv4 R&E Routing Table Report 17:05 GMT Sat 11 Oct, 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: 12759 Prefixes after maximum aggregation (per Origin AS): 7912 Deaggregation factor: 1.61 Unique aggregates announced (without unneeded subnets): 8621 Number of IPv4 prefixes with a valid ROA: 5736 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7022 Total ASes present in the Internet Routing Table: 2022 Prefixes per ASN: 6.31 Origin-only ASes present in the Internet Routing Table: 1745 Origin ASes announcing only one prefix: 842 Transit ASes present in the Internet Routing Table: 277 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: 4.5 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: 47679 Number of 32-bit ASNs visible in the Routing Table: 525 Prefixes from 32-bit ASNs in the Routing Table: 1284 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: 158460416 Equivalent to 9 /8s, 113 /16s and 234 /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: 1297 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3424 Total APNIC prefixes after maximum aggregation: 1774 APNIC Deaggregation factor: 1.93 Prefixes being announced from the APNIC address blocks: 3422 Unique aggregates announced from the APNIC address blocks: 1876 APNIC Region origin ASes present in the Internet Routing Table: 454 APNIC Prefixes per ASN: 7.54 APNIC Region origin ASes announcing only one prefix: 206 APNIC Region transit ASes present in the Internet Routing Table: 43 Average APNIC Region AS path length visible: 4.2 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: 40294496 Equivalent to 2 /8s, 102 /16s and 216 /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: 5305 Total ARIN prefixes after maximum aggregation: 3218 ARIN Deaggregation factor: 1.65 Prefixes being announced from the ARIN address blocks: 5333 Unique aggregates announced from the ARIN address blocks: 3593 ARIN Region origin ASes present in the Internet Routing Table: 868 ARIN Prefixes per ASN: 6.14 ARIN Region origin ASes announcing only one prefix: 326 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: 138 Number of ARIN addresses announced to Internet: 60095488 Equivalent to 3 /8s, 148 /16s and 252 /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: 3169 Total RIPE prefixes after maximum aggregation: 2603 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3156 Unique aggregates announced from the RIPE address blocks: 2655 RIPE Region origin ASes present in the Internet Routing Table: 573 RIPE Prefixes per ASN: 5.51 RIPE Region origin ASes announcing only one prefix: 265 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: 142 Number of RIPE addresses announced to Internet: 56478848 Equivalent to 3 /8s, 93 /16s and 204 /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: 480 Total LACNIC prefixes after maximum aggregation: 255 LACNIC Deaggregation factor: 1.88 Prefixes being announced from the LACNIC address blocks: 476 Unique aggregates announced from the LACNIC address blocks: 417 LACNIC Region origin ASes present in the Internet Routing Table: 36 LACNIC Prefixes per ASN: 13.22 LACNIC Region origin ASes announcing only one prefix: 16 LACNIC Region transit ASes present in the Internet Routing Table: 13 Average LACNIC Region AS path length visible: 4.4 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 8 Number of LACNIC addresses announced to Internet: 847904 Equivalent to 0 /8s, 12 /16s and 240 /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: 371 Total AfriNIC prefixes after maximum aggregation: 60 AfriNIC Deaggregation factor: 6.18 Prefixes being announced from the AfriNIC address blocks: 370 Unique aggregates announced from the AfriNIC address blocks: 78 AfriNIC Region origin ASes present in the Internet Routing Table: 45 AfriNIC Prefixes per ASN: 8.22 AfriNIC Region origin ASes announcing only one prefix: 29 AfriNIC Region transit ASes present in the Internet Routing Table: 6 Average AfriNIC Region AS path length visible: 5.9 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: 741376 Equivalent to 0 /8s, 11 /16s and 80 /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 605 2169 462 SINET-AS Research Organization of Informa 7497 451 180 23 CSTNET-AS-AP Computer Network Information 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 180 4192 70 ERX-CERNET-BKB China Education and Resear 7575 168 281 113 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 2697 56 4 33 ERX-ERNET-AS Education and Research Netwo 1659 50 666 31 ERX-TANET-ASN1 Taiwan Academic Network TA 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 197 16 1 UPRENET, PR 376 185 145 136 RISQ-AS, CA 2920 175 34 7 LACOE, US 2152 149 492 98 CENIC-2152, US 18558 138 18 4 NETBLK-RCOEK, US 21976 88 34 14 NJEDGE-NET, US 1736 79 16 1 MU-AS, US 3477 75 78 34 NOAA-NWAVE, US 81 71 154 30 NCREN, US 22742 70 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 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 786 214 1742 184 JANET Jisc Services Limited, GB 559 114 533 104 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 57 4 29 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 246 51 123 Rede Nacional de Ensino e Pesquisa, BR 11340 104 24 49 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 18 40 18 UNIVERSIDADE DE SAO PAULO, BR 52888 16 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 5 1 4 CEDIA, EC 27817 4 1 4 Red Nacional Academica de Tecnologia Avan 3596 3 0 3 Universidad Autonoma Metropolitana, MX 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 235 82 3 KENET-AS, KE 37215 41 8 1 MAREN, MW 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 37661 4 6 4 NRaE1-AS, NG 327798 4 0 3 BERNET, BI 328903 4 0 1 RITER, CI 328076 3 1 1 University-of-Mines-and-Technology, GH 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 605 2169 462 SINET-AS Research Organization of Informa 7497 451 180 23 CSTNET-AS-AP Computer Network Information 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 1916 246 51 123 Rede Nacional de Ensino e Pesquisa, BR 36914 235 82 3 KENET-AS, KE 786 214 1742 184 JANET Jisc Services Limited, GB 5786 197 16 1 UPRENET, PR 376 185 145 136 RISQ-AS, CA 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 180 4192 70 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 451 428 CSTNET-AS-AP Computer Network Information Cente 36914 235 232 KENET-AS, KE 5786 197 196 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 175 168 LACOE, US 18558 138 134 NETBLK-RCOEK, US 55824 151 130 NKN-CORE-NW NKN Core Network, IN 1916 246 123 Rede Nacional de Ensino e Pesquisa, BR 4538 180 110 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 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 /13:18 /14:30 /15:100 /16:1556 /17:273 /18:292 /19:401 /20:524 /21:619 /22:991 /23:1061 /24:6710 /25:52 /26:76 /27:45 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 218 235 KENET-AS, KE 1916 86 246 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 35 41 MAREN, MW 200521 32 57 SEAP-AGE, ES 25977 27 30 HCCS, US 22742 20 70 CT-EDU-NET, US 3233 18 30 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 8:1 12:1 14:95 23:4 24:2 31:1 35:1 37:26 38:3 40:1 41:77 42:13 44:5 45:22 46:4 47:1 49:12 58:15 59:17 60:6 62:5 63:3 64:14 65:1 66:24 67:31 68:4 69:10 70:2 71:1 72:7 74:16 76:3 77:2 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 98:2 101:3 102:12 103:279 104:68 108:2 109:1 111:3 114:1 118:33 119:30 121:11 122:8 124:42 128:33 129:36 130:83 131:44 132:19 133:158 134:82 136:196 137:36 138:10 139:5 140:13 141:1 142:28 143:11 144:43 145:13 146:116 147:14 148:9 149:11 150:7 151:8 152:67 153:12 154:14 155:23 156:125 157:7 158:28 159:116 160:33 161:22 162:9 163:72 164:8 165:3 167:9 168:13 169:5 170:12 173:5 175:3 179:3 180:16 182:2 184:8 185:36 187:3 188:21 191:2 192:1138 193:244 194:85 195:41 196:11 197:184 198:309 199:192 200:168 202:380 203:185 204:273 205:106 206:129 207:195 208:11 209:60 210:107 211:2 212:41 213:4 216:50 217:23 219:6 222:3 223:6 End of report