IPv4 R&E Routing Table Report 17:05 GMT Thu 09 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: 12587 Prefixes after maximum aggregation (per Origin AS): 7799 Deaggregation factor: 1.61 Unique aggregates announced (without unneeded subnets): 8493 Number of IPv4 prefixes with a valid ROA: 5626 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 6960 Total ASes present in the Internet Routing Table: 1988 Prefixes per ASN: 6.33 Origin-only ASes present in the Internet Routing Table: 1712 Origin ASes announcing only one prefix: 834 Transit ASes present in the Internet Routing Table: 276 Transit-only ASes present in the Internet Routing Table: 45 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: 16 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: 47652 Number of 32-bit ASNs visible in the Routing Table: 522 Prefixes from 32-bit ASNs in the Routing Table: 1278 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: 156751360 Equivalent to 9 /8s, 87 /16s and 214 /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: 1269 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3420 Total APNIC prefixes after maximum aggregation: 1770 APNIC Deaggregation factor: 1.93 Prefixes being announced from the APNIC address blocks: 3418 Unique aggregates announced from the APNIC address blocks: 1874 APNIC Region origin ASes present in the Internet Routing Table: 453 APNIC Prefixes per ASN: 7.55 APNIC Region origin ASes announcing only one prefix: 207 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: 16 Number of APNIC region 32-bit ASNs visible in the Routing Table: 205 Number of APNIC addresses announced to Internet: 40294752 Equivalent to 2 /8s, 102 /16s and 217 /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: 5140 Total ARIN prefixes after maximum aggregation: 3108 ARIN Deaggregation factor: 1.65 Prefixes being announced from the ARIN address blocks: 5166 Unique aggregates announced from the ARIN address blocks: 3459 ARIN Region origin ASes present in the Internet Routing Table: 833 ARIN Prefixes per ASN: 6.20 ARIN Region origin ASes announcing only one prefix: 316 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: 135 Number of ARIN addresses announced to Internet: 58471424 Equivalent to 3 /8s, 124 /16s and 52 /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: 3171 Total RIPE prefixes after maximum aggregation: 2605 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3160 Unique aggregates announced from the RIPE address blocks: 2659 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: 264 RIPE Region transit ASes present in the Internet Routing Table: 94 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: 56481408 Equivalent to 3 /8s, 93 /16s and 214 /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: 481 Total LACNIC prefixes after maximum aggregation: 256 LACNIC Deaggregation factor: 1.88 Prefixes being announced from the LACNIC address blocks: 477 Unique aggregates announced from the LACNIC address blocks: 423 LACNIC Region origin ASes present in the Internet Routing Table: 38 LACNIC Prefixes per ASN: 12.55 LACNIC Region origin ASes announcing only one prefix: 17 LACNIC Region transit ASes present in the Internet Routing Table: 14 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: 9 Number of LACNIC addresses announced to Internet: 850208 Equivalent to 0 /8s, 12 /16s and 249 /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: 365 Total AfriNIC prefixes after maximum aggregation: 58 AfriNIC Deaggregation factor: 6.29 Prefixes being announced from the AfriNIC address blocks: 364 Unique aggregates announced from the AfriNIC address blocks: 76 AfriNIC Region origin ASes present in the Internet Routing Table: 44 AfriNIC Prefixes per ASN: 8.27 AfriNIC Region origin ASes announcing only one prefix: 30 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: 651264 Equivalent to 0 /8s, 9 /16s and 240 /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 606 2169 463 SINET-AS Research Organization of Informa 7497 451 180 23 CSTNET-AS-AP Computer Network Information 4538 182 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 169 281 114 AARNET-AS-AP Australian Academic and Rese 55824 150 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 198 16 1 UPRENET, PR 376 189 145 140 RISQ-AS, CA 2920 177 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 72 78 32 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 107 24 49 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 18 40 18 UNIVERSIDADE DE SAO PAULO, BR 278 11 9 10 Universidad Nacional Autonoma de Mexico, 52888 10 7 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 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 231 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 6 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 606 2169 463 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 231 82 3 KENET-AS, KE 786 214 1742 184 JANET Jisc Services Limited, GB 5786 198 16 1 UPRENET, PR 376 189 145 140 RISQ-AS, CA 4538 182 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 451 428 CSTNET-AS-AP Computer Network Information Cente 36914 231 228 KENET-AS, KE 5786 198 197 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 177 170 LACOE, US 18558 138 134 NETBLK-RCOEK, US 55824 150 129 NKN-CORE-NW NKN Core Network, IN 1916 246 123 Rede Nacional de Ensino e Pesquisa, BR 4538 182 111 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 /16:1533 /17:265 /18:277 /19:395 /20:514 /21:614 /22:972 /23:1049 /24:6633 /25:54 /26:77 /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 214 231 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 14:94 23:4 24:2 31:1 35:1 37:26 38:2 40:1 41:72 42:13 44:5 45:23 46:4 47:1 49:12 58:15 59:17 60:6 62:5 63:3 64:14 65:1 66:22 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 91:35 93:14 94:2 95:1 96:5 98:2 101:3 102:11 103:277 104:67 108:2 109:1 111:3 114:1 118:33 119:30 121:11 122:8 124:42 128:33 129:36 130:83 131:43 132:19 133:158 134:82 136:197 137:35 138:10 139:5 140:13 141:1 142:24 143:11 144:39 145:13 146:123 147:14 148:9 149:11 150:7 151:8 152:67 153:12 154:15 155:23 156:127 157:7 158:28 159:116 160:33 161:21 162:9 163:72 164:8 165:3 167:9 168:13 169:5 170:12 173:5 175:3 179:3 180:16 182:1 184:8 185:36 187:3 188:21 191:2 192:1122 193:244 194:85 195:42 196:11 197:185 198:308 199:184 200:162 202:382 203:186 204:268 205:92 206:130 207:193 208:9 209:51 210:102 211:2 212:41 213:4 216:47 217:23 219:6 222:3 223:6 End of report