IPv4 R&E Routing Table Report 17:05 GMT Tue 26 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: 14763 Prefixes after maximum aggregation (per Origin AS): 8673 Deaggregation factor: 1.70 Unique aggregates announced (without unneeded subnets): 9421 Number of IPv4 prefixes with a valid ROA: 6396 Number of IPv4 prefixes with an invalid ROA: 2 Number of IPv4 prefixes with no ROA: 8365 Total ASes present in the Internet Routing Table: 2265 Prefixes per ASN: 6.52 Origin-only ASes present in the Internet Routing Table: 1982 Origin ASes announcing only one prefix: 897 Transit ASes present in the Internet Routing Table: 283 Transit-only ASes present in the Internet Routing Table: 35 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: 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: 47271 Number of 32-bit ASNs visible in the Routing Table: 592 Prefixes from 32-bit ASNs in the Routing Table: 1568 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: 3 Number of addresses announced to Internet: 172567680 Equivalent to 10 /8s, 73 /16s and 44 /24s Percentage of available address space announced: 4.7 Percentage of allocated address space announced: 4.7 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: 1515 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3720 Total APNIC prefixes after maximum aggregation: 1848 APNIC Deaggregation factor: 2.01 Prefixes being announced from the APNIC address blocks: 3717 Unique aggregates announced from the APNIC address blocks: 1967 APNIC Region origin ASes present in the Internet Routing Table: 488 APNIC Prefixes per ASN: 7.62 APNIC Region origin ASes announcing only one prefix: 217 APNIC Region transit ASes present in the Internet Routing Table: 42 Average APNIC Region AS path length visible: 4.3 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 216 Number of APNIC addresses announced to Internet: 37927008 Equivalent to 2 /8s, 66 /16s and 184 /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: 6486 Total ARIN prefixes after maximum aggregation: 3803 ARIN Deaggregation factor: 1.71 Prefixes being announced from the ARIN address blocks: 6535 Unique aggregates announced from the ARIN address blocks: 4266 ARIN Region origin ASes present in the Internet Routing Table: 1031 ARIN Prefixes per ASN: 6.34 ARIN Region origin ASes announcing only one prefix: 360 ARIN Region transit ASes present in the Internet Routing Table: 126 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: 167 Number of ARIN addresses announced to Internet: 74349152 Equivalent to 4 /8s, 110 /16s and 122 /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: 3163 Total RIPE prefixes after maximum aggregation: 2609 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3149 Unique aggregates announced from the RIPE address blocks: 2657 RIPE Region origin ASes present in the Internet Routing Table: 576 RIPE Prefixes per ASN: 5.47 RIPE Region origin ASes announcing only one prefix: 262 RIPE Region transit ASes present in the Internet Routing Table: 92 Average RIPE Region AS path length visible: 3.8 Max RIPE Region AS path length visible: 13 Number of RIPE region 32-bit ASNs visible in the Routing Table: 140 Number of RIPE addresses announced to Internet: 56416896 Equivalent to 3 /8s, 92 /16s and 218 /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: 955 Total LACNIC prefixes after maximum aggregation: 348 LACNIC Deaggregation factor: 2.74 Prefixes being announced from the LACNIC address blocks: 953 Unique aggregates announced from the LACNIC address blocks: 437 LACNIC Region origin ASes present in the Internet Routing Table: 93 LACNIC Prefixes per ASN: 10.25 LACNIC Region origin ASes announcing only one prefix: 33 LACNIC Region transit ASes present in the Internet Routing Table: 12 Average LACNIC Region AS path length visible: 4.7 Max LACNIC Region AS path length visible: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 41 Number of LACNIC addresses announced to Internet: 3272256 Equivalent to 0 /8s, 49 /16s and 238 /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: 407 Total AfriNIC prefixes after maximum aggregation: 61 AfriNIC Deaggregation factor: 6.67 Prefixes being announced from the AfriNIC address blocks: 406 Unique aggregates announced from the AfriNIC address blocks: 91 AfriNIC Region origin ASes present in the Internet Routing Table: 41 AfriNIC Prefixes per ASN: 9.90 AfriNIC Region origin ASes announcing only one prefix: 25 AfriNIC Region transit ASes present in the Internet Routing Table: 7 Average AfriNIC Region AS path length visible: 7.0 Max AfriNIC Region AS path length visible: 15 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 28 Number of AfriNIC addresses announced to Internet: 599808 Equivalent to 0 /8s, 9 /16s and 39 /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 463 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 4538 185 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 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 4621 59 35 8 UNINET-AS-AP UNINET-, TH 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 376 200 162 150 RISQ-AS, CA 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 81 126 471 35 NCREN, US 21976 88 34 14 NJEDGE-NET, US 237 84 542 50 MERIT-AS-14, US 1736 79 16 1 MU-AS, US 3477 78 79 37 NOAA-NWAVE, 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 328 177 43 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 47 99 35 Fundacao Carlos Chagas Filho de Amparo a 61468 45 3 21 CEDIA, EC 1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 20191 26 16 1 Pontificia Universidad Catolica de Chile, 21612 25 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR 28027 13 2 6 Escuela Superior Politecnica del Litoral, 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 257 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 605 2169 463 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 1916 328 177 43 Rede Nacional de Ensino e Pesquisa, BR 680 284 1883 251 DFN Verein zur Foerderung eines Deutschen 36914 257 82 3 KENET-AS, KE 376 200 162 150 RISQ-AS, CA 5786 198 16 1 UPRENET, PR 786 190 1742 185 JANET Jisc Services Limited, GB 4538 185 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 452 429 CSTNET-AS-AP Computer Network Information Cente 1916 328 285 Rede Nacional de Ensino e Pesquisa, BR 36914 257 254 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 4538 185 114 ERX-CERNET-BKB China Education and Research Net 81 126 91 NCREN, 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 202.14.117.0/24 Origin: 17827 STOU-AS-TH Sukhothai Thammathirat Open U 202.14.117.0/24 Transit: 4621 UNINET-AS-AP UNINET-, TH 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 /13:16 /14:34 /15:99 /16:1726 /17:329 /18:367 /19:484 /20:685 /21:685 /22:1113 /23:1215 /24:7832 /25:54 /26:74 /27:39 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 249 257 KENET-AS, KE 1916 88 328 Rede Nacional de Ensino e Pesquisa, BR 200521 34 59 SEAP-AGE, ES 37215 32 38 MAREN, MW 25977 28 42 HCCS, US 32440 28 45 LONI, US 60187 25 50 LGFL-AS, GB 26898 24 64 RESERVED, ZZ 36794 24 26 META SOLUTIONS PIKETON, US 61468 23 45 CEDIA, EC 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 23:5 24:2 31:1 35:4 37:14 38:4 41:54 42:13 44:5 45:32 46:5 47:1 49:12 50:2 58:15 59:18 60:6 61:2 62:5 63:3 64:39 65:3 66:17 67:33 68:2 69:12 70:2 71:1 72:7 74:15 76:23 77:6 78:3 79:9 80:8 81:27 82:2 83:7 84:6 85:28 87:1 89:9 91:36 93:15 94:2 95:2 96:5 98:2 101:3 102:10 103:290 104:73 108:8 109:1 110:1 111:7 114:1 116:6 118:33 119:31 121:23 122:8 124:42 128:35 129:40 130:94 131:60 132:49 133:156 134:81 136:197 137:46 138:11 139:5 140:28 141:3 142:26 143:19 144:32 145:2 146:126 147:15 148:9 149:11 150:10 151:10 152:117 153:15 154:14 155:46 156:131 157:23 158:25 159:116 160:34 161:29 162:18 163:72 164:10 165:4 167:9 168:35 169:5 170:16 172:1 173:5 175:5 177:2 179:12 180:16 182:4 184:6 185:40 186:3 187:4 188:14 190:15 191:3 192:1249 193:248 194:89 195:68 196:10 197:236 198:370 199:222 200:277 201:6 202:504 203:281 204:332 205:120 206:165 207:203 208:48 209:71 210:102 211:2 212:43 213:4 216:51 217:23 219:6 220:3 222:3 223:5 End of report