IPv4 R&E Routing Table Report 17:05 GMT Mon 19 May, 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: 13528 Prefixes after maximum aggregation (per Origin AS): 8093 Deaggregation factor: 1.67 Unique aggregates announced (without unneeded subnets): 8879 Number of IPv4 prefixes with a valid ROA: 5729 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7798 Total ASes present in the Internet Routing Table: 2059 Prefixes per ASN: 6.57 Origin-only ASes present in the Internet Routing Table: 1782 Origin ASes announcing only one prefix: 829 Transit ASes present in the Internet Routing Table: 277 Transit-only ASes present in the Internet Routing Table: 48 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: 20 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: 46452 Number of 32-bit ASNs visible in the Routing Table: 511 Prefixes from 32-bit ASNs in the Routing Table: 1335 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: 161889792 Equivalent to 9 /8s, 166 /16s and 62 /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: 1612 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3228 Total APNIC prefixes after maximum aggregation: 1669 APNIC Deaggregation factor: 1.93 Prefixes being announced from the APNIC address blocks: 3227 Unique aggregates announced from the APNIC address blocks: 1814 APNIC Region origin ASes present in the Internet Routing Table: 436 APNIC Prefixes per ASN: 7.40 APNIC Region origin ASes announcing only one prefix: 208 APNIC Region transit ASes present in the Internet Routing Table: 40 Average APNIC Region AS path length visible: 4.0 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 195 Number of APNIC addresses announced to Internet: 37238080 Equivalent to 2 /8s, 56 /16s and 53 /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: 5818 Total ARIN prefixes after maximum aggregation: 3424 ARIN Deaggregation factor: 1.70 Prefixes being announced from the ARIN address blocks: 5869 Unique aggregates announced from the ARIN address blocks: 3834 ARIN Region origin ASes present in the Internet Routing Table: 911 ARIN Prefixes per ASN: 6.44 ARIN Region origin ASes announcing only one prefix: 326 ARIN Region transit ASes present in the Internet Routing Table: 116 Average ARIN Region AS path length visible: 5.0 Max ARIN Region AS path length visible: 10 Number of ARIN region 32-bit ASNs visible in the Routing Table: 139 Number of ARIN addresses announced to Internet: 65995680 Equivalent to 3 /8s, 239 /16s and 3 /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: 3145 Total RIPE prefixes after maximum aggregation: 2595 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3130 Unique aggregates announced from the RIPE address blocks: 2650 RIPE Region origin ASes present in the Internet Routing Table: 566 RIPE Prefixes per ASN: 5.53 RIPE Region origin ASes announcing only one prefix: 252 RIPE Region transit ASes present in the Internet Routing Table: 90 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: 135 Number of RIPE addresses announced to Internet: 56275584 Equivalent to 3 /8s, 90 /16s and 178 /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: 716 Total LACNIC prefixes after maximum aggregation: 348 LACNIC Deaggregation factor: 2.06 Prefixes being announced from the LACNIC address blocks: 712 Unique aggregates announced from the LACNIC address blocks: 499 LACNIC Region origin ASes present in the Internet Routing Table: 69 LACNIC Prefixes per ASN: 10.32 LACNIC Region origin ASes announcing only one prefix: 28 LACNIC Region transit ASes present in the Internet Routing Table: 16 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: 26 Number of LACNIC addresses announced to Internet: 1797280 Equivalent to 0 /8s, 27 /16s and 108 /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: 589 Total AfriNIC prefixes after maximum aggregation: 53 AfriNIC Deaggregation factor: 11.11 Prefixes being announced from the AfriNIC address blocks: 588 Unique aggregates announced from the AfriNIC address blocks: 80 AfriNIC Region origin ASes present in the Internet Routing Table: 28 AfriNIC Prefixes per ASN: 21.00 AfriNIC Region origin ASes announcing only one prefix: 15 AfriNIC Region transit ASes present in the Internet Routing Table: 7 Average AfriNIC Region AS path length visible: 5.8 Max AfriNIC Region AS path length visible: 20 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 16 Number of AfriNIC addresses announced to Internet: 580864 Equivalent to 0 /8s, 8 /16s and 221 /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 599 2170 464 SINET-AS Research Organization of Informa 7497 454 180 24 CSTNET-AS-AP Computer Network Information 4538 190 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 173 281 117 AARNET-AS-AP Australian Academic and Rese 55824 146 19 21 NKN-CORE-NW NKN Core Network, IN 2697 58 4 34 ERX-ERNET-AS Education and Research Netwo 45773 48 3 5 HECPERN-AS-PK PERN AS Content Servie Prov 132524 42 9 10 TIFR-AS Tata Institute of Fundamental Res 24361 33 56 17 CNGI-NJ-IX-AS-AP CERNET2 IX at Southeast 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 376 198 162 147 RISQ-AS, CA 2920 176 34 7 LACOE, US 2152 147 507 97 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 81 99 361 26 NCREN, US 23024 99 7 17 OCDE, US 21976 88 34 14 NJEDGE-NET, US 1736 79 16 1 MU-AS, US 22742 67 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 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 786 194 1742 187 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Peering requests: peering@switch.c 1103 95 1471 82 SURFNET-NL SURFnet, The Netherlands, NL 2614 89 26 69 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 79 88 74 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 57 4 23 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 268 59 116 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 52 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 43 67 32 Fundacao Carlos Chagas Filho de Amparo a 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR 278 14 9 12 Universidad Nacional Autonoma de Mexico, 52888 13 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 61468 11 1 10 CEDIA, EC 10715 9 18 3 Universidade Federal de Santa Catarina, B 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 491 82 3 KENET-AS, KE 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 37654 10 1 6 RwEdNet-AS, RW 327700 10 16 1 MoRENet, MZ 37661 9 6 3 NRaE1-AS, NG 327798 4 0 3 BERNET, BI 327947 4 1 4 KNUST-, GH 37182 2 8 1 TERNET, TZ 37496 2 0 1 Aga-Khan-University, 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 599 2170 464 SINET-AS Research Organization of Informa 36914 491 82 3 KENET-AS, KE 7497 454 180 24 CSTNET-AS-AP Computer Network Information 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 1916 268 59 116 Rede Nacional de Ensino e Pesquisa, BR 5786 199 16 1 UPRENET, PR 376 198 162 147 RISQ-AS, CA 786 194 1742 187 JANET Jisc Services Limited, GB 4538 190 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 491 488 KENET-AS, KE 7497 454 430 CSTNET-AS-AP Computer Network Information Cente 5786 199 198 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE, US 1916 268 152 Rede Nacional de Ensino e Pesquisa, BR 18558 139 135 NETBLK-RCOEK, US 55824 146 125 NKN-CORE-NW NKN Core Network, IN 4538 190 119 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 /13:16 /14:30 /15:99 /16:1611 /17:297 /18:308 /19:449 /20:543 /21:594 /22:1004 /23:1092 /24:7315 /25:51 /26:77 /27:31 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 467 491 KENET-AS, KE 1916 85 268 Rede Nacional de Ensino e Pesquisa, BR 23024 38 99 OCDE, US 200521 32 57 SEAP-AGE, ES 32440 31 55 LONI, US 25977 27 30 HCCS, US 26898 24 64 RESERVED, ZZ 36794 24 26 META SOLUTIONS PIKETON, US 60187 23 48 LGFL-AS, GB 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 5:16 8:2 12:1 14:92 23:3 24:2 31:1 37:9 38:4 40:1 41:138 42:13 44:4 45:24 46:4 47:1 49:10 58:16 59:1 60:6 61:2 62:5 63:3 64:30 66:19 67:31 68:1 69:8 70:2 72:7 74:16 76:32 77:6 78:3 79:9 80:8 81:23 82:3 83:7 84:6 85:31 87:1 89:10 91:35 93:15 94:2 95:2 96:5 98:2 101:2 102:2 103:269 104:76 108:4 109:1 111:17 114:1 116:6 118:2 119:23 121:28 123:8 124:42 128:33 129:35 130:94 131:53 132:58 133:156 134:75 136:198 137:47 138:10 139:10 140:26 141:2 142:25 143:14 144:25 145:2 146:121 147:15 148:9 149:12 150:6 151:5 152:111 153:13 154:22 155:38 156:128 157:11 158:27 159:116 160:34 161:9 162:17 163:61 164:12 165:2 167:10 168:12 169:5 170:12 172:1 173:5 177:1 179:9 180:16 182:1 184:7 185:36 186:1 187:7 188:13 190:1 191:2 192:1157 193:252 194:85 195:67 196:11 197:332 198:335 199:198 200:254 201:2 202:358 203:179 204:315 205:97 206:162 207:200 208:48 209:93 210:104 211:3 212:42 213:4 216:52 217:22 219:7 220:3 222:3 223:5 End of report