IPv4 R&E Routing Table Report 17:05 GMT Mon 25 Aug, 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: 13007 Prefixes after maximum aggregation (per Origin AS): 7918 Deaggregation factor: 1.64 Unique aggregates announced (without unneeded subnets): 8664 Number of IPv4 prefixes with a valid ROA: 5487 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7519 Total ASes present in the Internet Routing Table: 2023 Prefixes per ASN: 6.43 Origin-only ASes present in the Internet Routing Table: 1748 Origin ASes announcing only one prefix: 818 Transit ASes present in the Internet Routing Table: 275 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: 15 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: 47270 Number of 32-bit ASNs visible in the Routing Table: 523 Prefixes from 32-bit ASNs in the Routing Table: 1336 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: 158366848 Equivalent to 9 /8s, 112 /16s and 124 /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: 1410 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3430 Total APNIC prefixes after maximum aggregation: 1770 APNIC Deaggregation factor: 1.94 Prefixes being announced from the APNIC address blocks: 3428 Unique aggregates announced from the APNIC address blocks: 1904 APNIC Region origin ASes present in the Internet Routing Table: 454 APNIC Prefixes per ASN: 7.55 APNIC Region origin ASes announcing only one prefix: 211 APNIC Region transit ASes present in the Internet Routing Table: 44 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: 204 Number of APNIC addresses announced to Internet: 37665120 Equivalent to 2 /8s, 62 /16s and 185 /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: 5513 Total ARIN prefixes after maximum aggregation: 3229 ARIN Deaggregation factor: 1.71 Prefixes being announced from the ARIN address blocks: 5559 Unique aggregates announced from the ARIN address blocks: 3590 ARIN Region origin ASes present in the Internet Routing Table: 875 ARIN Prefixes per ASN: 6.35 ARIN Region origin ASes announcing only one prefix: 307 ARIN Region transit ASes present in the Internet Routing Table: 120 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: 143 Number of ARIN addresses announced to Internet: 62914176 Equivalent to 3 /8s, 191 /16s and 254 /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: 3152 Total RIPE prefixes after maximum aggregation: 2598 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3140 Unique aggregates announced from the RIPE address blocks: 2650 RIPE Region origin ASes present in the Internet Routing Table: 570 RIPE Prefixes per ASN: 5.51 RIPE Region origin ASes announcing only one prefix: 259 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: 138 Number of RIPE addresses announced to Internet: 56381568 Equivalent to 3 /8s, 92 /16s and 80 /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: 482 Total LACNIC prefixes after maximum aggregation: 255 LACNIC Deaggregation factor: 1.89 Prefixes being announced from the LACNIC address blocks: 481 Unique aggregates announced from the LACNIC address blocks: 426 LACNIC Region origin ASes present in the Internet Routing Table: 36 LACNIC Prefixes per ASN: 13.36 LACNIC Region origin ASes announcing only one prefix: 14 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: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 9 Number of LACNIC addresses announced to Internet: 812576 Equivalent to 0 /8s, 12 /16s and 102 /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: 398 Total AfriNIC prefixes after maximum aggregation: 62 AfriNIC Deaggregation factor: 6.42 Prefixes being announced from the AfriNIC address blocks: 397 Unique aggregates announced from the AfriNIC address blocks: 92 AfriNIC Region origin ASes present in the Internet Routing Table: 42 AfriNIC Prefixes per ASN: 9.45 AfriNIC Region origin ASes announcing only one prefix: 27 AfriNIC Region transit ASes present in the Internet Routing Table: 7 Average AfriNIC Region AS path length visible: 6.9 Max AfriNIC Region AS path length visible: 15 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 29 Number of AfriNIC addresses announced to Internet: 591104 Equivalent to 0 /8s, 9 /16s and 5 /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 604 2169 462 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 181 4192 71 ERX-CERNET-BKB China Education and Resear 7575 170 281 114 AARNET-AS-AP Australian Academic and Rese 55824 149 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 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 132524 42 8 9 TIFR-AS Tata Institute of Fundamental Res 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 178 34 7 LACOE, US 2152 148 491 97 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 81 95 312 26 NCREN, US 21976 88 34 14 NJEDGE-NET, US 376 79 6 56 RISQ-AS, CA 1736 79 16 1 MU-AS, US 22742 69 37 32 CT-EDU-NET, US 1706 65 53 55 UNIV-ARIZ, 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 1883 251 DFN Verein zur Foerderung eines Deutschen 786 190 1742 185 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Switch, Swiss Academic and Researc 1103 98 1503 84 SURFNET-NL SURFnet, The Netherlands, NL 2614 92 26 69 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 78 88 73 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 247 51 126 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 18 40 18 UNIVERSIDADE DE SAO PAULO, BR 61468 10 1 9 CEDIA, EC 52888 9 7 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 28027 8 2 2 Escuela Superior Politecnica del Litoral, 27817 4 1 4 Red Nacional Academica de Tecnologia Avan 263076 4 1 1 Universidade Estadual de Maringa - UEM, B 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 248 82 3 KENET-AS, KE 37215 38 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 604 2169 462 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 680 284 1883 251 DFN Verein zur Foerderung eines Deutschen 36914 248 82 3 KENET-AS, KE 1916 247 51 126 Rede Nacional de Ensino e Pesquisa, BR 5786 198 16 1 UPRENET, PR 786 190 1742 185 JANET Jisc Services Limited, GB 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 181 4192 71 ERX-CERNET-BKB China Education and Resear 2920 178 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 452 429 CSTNET-AS-AP Computer Network Information Cente 36914 248 245 KENET-AS, KE 5786 198 197 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 178 171 LACOE, US 18558 139 135 NETBLK-RCOEK, US 55824 149 128 NKN-CORE-NW NKN Core Network, IN 1916 247 121 Rede Nacional de Ensino e Pesquisa, BR 4538 181 110 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 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 /13:15 /14:30 /15:97 /16:1568 /17:278 /18:299 /19:411 /20:563 /21:589 /22:972 /23:1088 /24:6904 /25:56 /26:78 /27:48 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 240 248 KENET-AS, KE 1916 87 247 Rede Nacional de Ensino e Pesquisa, BR 200521 34 59 SEAP-AGE, ES 37215 32 38 MAREN, MW 25977 27 30 HCCS, US 32440 27 38 LONI, US 60187 25 50 LGFL-AS, GB 26898 24 64 RESERVED, ZZ 36794 24 26 META SOLUTIONS PIKETON, US 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) ---------------------------------------------- 1:1 5:18 8:2 12:1 14:93 23:3 24:2 31:1 35:1 37:14 38:3 41:52 42:13 44:5 45:19 46:5 47:1 49:12 58:15 59:17 60:6 62:5 63:3 64:27 65:3 66:15 67:31 68:2 69:12 70:2 72:7 74:12 76:22 77:6 78:3 79:9 80:8 81:26 82:2 83:7 84:6 85:28 87:1 89:9 91:36 93:15 94:2 95:1 96:5 98:2 101:2 102:11 103:285 104:72 108:4 109:1 111:7 114:1 118:33 119:31 121:23 122:8 123:8 124:42 128:31 129:33 130:93 131:53 132:40 133:156 134:79 136:197 137:44 138:11 139:5 140:25 141:1 142:21 143:12 144:22 145:4 146:123 147:13 148:9 149:11 150:7 151:4 152:76 153:13 154:14 155:39 156:128 157:4 158:25 159:116 160:32 161:21 162:15 163:72 164:8 165:3 167:9 168:35 169:5 170:9 173:5 175:4 179:6 180:16 182:2 184:6 185:39 187:4 188:14 190:1 191:2 192:1140 193:247 194:87 195:68 196:11 197:229 198:316 199:192 200:160 201:2 202:384 203:185 204:306 205:59 206:138 207:195 208:47 209:64 210:102 211:2 212:43 213:4 216:47 217:23 219:6 220:3 222:3 223:5 End of report