IPv4 R&E Routing Table Report 17:05 GMT Sat 02 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: 13710 Prefixes after maximum aggregation (per Origin AS): 8043 Deaggregation factor: 1.70 Unique aggregates announced (without unneeded subnets): 8761 Number of IPv4 prefixes with a valid ROA: 5940 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7769 Total ASes present in the Internet Routing Table: 2046 Prefixes per ASN: 6.70 Origin-only ASes present in the Internet Routing Table: 1772 Origin ASes announcing only one prefix: 821 Transit ASes present in the Internet Routing Table: 274 Transit-only ASes present in the Internet Routing Table: 41 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: 32 Number of instances of unregistered ASNs: 32 Number of 32-bit ASNs allocated by the RIRs: 47037 Number of 32-bit ASNs visible in the Routing Table: 513 Prefixes from 32-bit ASNs in the Routing Table: 1315 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: 161682496 Equivalent to 9 /8s, 163 /16s and 20 /24s Percentage of available address space announced: 4.4 Percentage of allocated address space announced: 4.4 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: 1701 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3464 Total APNIC prefixes after maximum aggregation: 1757 APNIC Deaggregation factor: 1.97 Prefixes being announced from the APNIC address blocks: 3463 Unique aggregates announced from the APNIC address blocks: 1921 APNIC Region origin ASes present in the Internet Routing Table: 455 APNIC Prefixes per ASN: 7.61 APNIC Region origin ASes announcing only one prefix: 211 APNIC Region transit ASes present in the Internet Routing Table: 42 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: 203 Number of APNIC addresses announced to Internet: 37640288 Equivalent to 2 /8s, 62 /16s and 88 /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: 5782 Total ARIN prefixes after maximum aggregation: 3395 ARIN Deaggregation factor: 1.70 Prefixes being announced from the ARIN address blocks: 5830 Unique aggregates announced from the ARIN address blocks: 3800 ARIN Region origin ASes present in the Internet Routing Table: 903 ARIN Prefixes per ASN: 6.46 ARIN Region origin ASes announcing only one prefix: 319 ARIN Region transit ASes present in the Internet Routing Table: 118 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: 148 Number of ARIN addresses announced to Internet: 64990336 Equivalent to 3 /8s, 223 /16s and 172 /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: 3154 Total RIPE prefixes after maximum aggregation: 2600 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3142 Unique aggregates announced from the RIPE address blocks: 2645 RIPE Region origin ASes present in the Internet Routing Table: 569 RIPE Prefixes per ASN: 5.52 RIPE Region origin ASes announcing only one prefix: 258 RIPE Region transit ASes present in the Internet Routing Table: 88 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: 136 Number of RIPE addresses announced to Internet: 56385408 Equivalent to 3 /8s, 92 /16s and 95 /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: 657 Total LACNIC prefixes after maximum aggregation: 247 LACNIC Deaggregation factor: 2.66 Prefixes being announced from the LACNIC address blocks: 653 Unique aggregates announced from the LACNIC address blocks: 324 LACNIC Region origin ASes present in the Internet Routing Table: 57 LACNIC Prefixes per ASN: 11.46 LACNIC Region origin ASes announcing only one prefix: 23 LACNIC Region transit ASes present in the Internet Routing Table: 15 Average LACNIC Region AS path length visible: 4.5 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 19 Number of LACNIC addresses announced to Internet: 2067680 Equivalent to 0 /8s, 31 /16s and 140 /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: 621 Total AfriNIC prefixes after maximum aggregation: 40 AfriNIC Deaggregation factor: 15.53 Prefixes being announced from the AfriNIC address blocks: 620 Unique aggregates announced from the AfriNIC address blocks: 69 AfriNIC Region origin ASes present in the Internet Routing Table: 20 AfriNIC Prefixes per ASN: 31.00 AfriNIC Region origin ASes announcing only one prefix: 10 AfriNIC Region transit ASes present in the Internet Routing Table: 5 Average AfriNIC Region AS path length visible: 5.7 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 7 Number of AfriNIC addresses announced to Internet: 596480 Equivalent to 0 /8s, 9 /16s and 26 /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 461 SINET-AS Research Organization of Informa 7497 453 180 23 CSTNET-AS-AP Computer Network Information 4538 189 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 170 281 115 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 57 4 34 ERX-ERNET-AS Education and Research Netwo 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 45773 48 3 5 HECPERN-AS-PK PERN AS Content Servie Prov 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 199 16 1 UPRENET, PR 376 198 162 149 RISQ-AS, CA 2920 179 34 7 LACOE, US 2152 148 491 97 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 81 101 339 32 NCREN, US 23024 99 7 17 OCDE, US 21976 88 34 14 NJEDGE-NET, US 1736 78 16 1 MU-AS, US 22742 68 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 680 288 1899 250 DFN Verein zur Foerderung eines Deutschen 786 193 1742 187 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Switch, Swiss Academic and Researc 1103 97 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 58 4 27 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 291 172 32 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 52 Red Universitaria Nacional, CL 2715 46 83 34 Fundacao Carlos Chagas Filho de Amparo a 20191 26 16 1 Pontificia Universidad Catolica de Chile, 21612 23 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR 61468 15 1 11 CEDIA, EC 278 13 9 11 Universidad Nacional Autonoma de Mexico, 52888 12 7 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 2716 9 26 8 Universidade Federal do Rio Grande do Sul 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 504 82 3 KENET-AS, KE 37215 37 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 327798 4 0 3 BERNET, BI 328903 4 0 1 RITER, CI 37661 3 6 3 NRaE1-AS, NG 37182 2 8 1 TERNET, TZ 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 461 SINET-AS Research Organization of Informa 36914 504 82 3 KENET-AS, KE 7497 453 180 23 CSTNET-AS-AP Computer Network Information 1916 291 172 32 Rede Nacional de Ensino e Pesquisa, BR 680 288 1899 250 DFN Verein zur Foerderung eines Deutschen 5786 199 16 1 UPRENET, PR 376 198 162 149 RISQ-AS, CA 786 193 1742 187 JANET Jisc Services Limited, GB 4538 189 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 36914 504 501 KENET-AS, KE 7497 453 430 CSTNET-AS-AP Computer Network Information Cente 1916 291 259 Rede Nacional de Ensino e Pesquisa, BR 5786 199 198 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 179 172 LACOE, US 18558 139 135 NETBLK-RCOEK, US 55824 149 128 NKN-CORE-NW NKN Core Network, IN 4538 189 118 ERX-CERNET-BKB China Education and Research Net 23024 99 82 OCDE, 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 /16:1612 /17:281 /18:321 /19:433 /20:594 /21:614 /22:999 /23:1109 /24:7409 /25:56 /26:81 /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 480 504 KENET-AS, KE 1916 88 291 Rede Nacional de Ensino e Pesquisa, BR 23024 38 99 OCDE, US 200521 33 58 SEAP-AGE, ES 37215 31 37 MAREN, MW 25977 27 30 HCCS, US 32440 27 39 LONI, US 26898 24 64 RESERVED, ZZ 36794 24 26 META SOLUTIONS PIKETON, US 60187 23 48 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 5:16 8:2 12:1 14:93 23:3 24:2 31:1 35:1 37:14 38:3 40:1 41:169 42:13 44:4 45:24 46:5 47:1 49:12 58:15 59:17 60:6 62:5 63:3 64:30 65:3 66:19 67:32 68:2 69:12 70:2 72:7 74:16 76:22 77:6 78:3 79:9 80:8 81:26 82:2 83:7 84:6 85:31 87:1 89:10 91:35 93:15 94:2 95:1 96:5 98:2 101:2 102:4 103:289 104:72 108:4 109:1 111:17 114:1 118:33 119:31 121:28 122:8 123:8 124:42 128:35 129:36 130:94 131:53 132:57 133:156 134:77 136:198 137:44 138:11 139:5 140:25 141:2 142:21 143:12 144:24 145:4 146:123 147:14 148:9 149:10 150:8 151:4 152:107 153:13 154:14 155:39 156:129 157:20 158:26 159:115 160:34 161:10 162:15 163:73 164:6 165:3 167:6 168:35 169:5 170:6 173:5 175:4 177:2 179:5 180:16 182:1 184:6 185:39 187:5 188:14 190:2 191:2 192:1178 193:249 194:86 195:67 196:8 197:344 198:332 199:195 200:177 201:6 202:382 203:184 204:313 205:95 206:158 207:199 208:48 209:98 210:103 211:2 212:43 213:4 216:53 217:22 219:7 220:3 222:3 223:5 End of report