IPv4 R&E Routing Table Report 17:05 GMT Wed 20 May, 2026 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: 13515 Prefixes after maximum aggregation (per Origin AS): 8281 Deaggregation factor: 1.63 Unique aggregates announced (without unneeded subnets): 9247 Number of IPv4 prefixes with a valid ROA: 5981 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7533 Total ASes present in the Internet Routing Table: 2098 Prefixes per ASN: 6.44 Origin-only ASes present in the Internet Routing Table: 1815 Origin ASes announcing only one prefix: 847 Transit ASes present in the Internet Routing Table: 283 Transit-only ASes present in the Internet Routing Table: 44 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: 1 Number of instances of unregistered ASNs: 1 Number of 32-bit ASNs allocated by the RIRs: 49818 Number of 32-bit ASNs visible in the Routing Table: 523 Prefixes from 32-bit ASNs in the Routing Table: 1347 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: 1 Number of addresses announced to Internet: 165527968 Equivalent to 9 /8s, 221 /16s and 193 /24s Percentage of available address space announced: 4.5 Percentage of allocated address space announced: 4.5 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: 1313 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3354 Total APNIC prefixes after maximum aggregation: 1713 APNIC Deaggregation factor: 1.96 Prefixes being announced from the APNIC address blocks: 3355 Unique aggregates announced from the APNIC address blocks: 1819 APNIC Region origin ASes present in the Internet Routing Table: 441 APNIC Prefixes per ASN: 7.61 APNIC Region origin ASes announcing only one prefix: 206 APNIC Region transit ASes present in the Internet Routing Table: 40 Average APNIC Region AS path length visible: 4.3 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 192 Number of APNIC addresses announced to Internet: 41068608 Equivalent to 2 /8s, 114 /16s and 168 /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: 6157 Total ARIN prefixes after maximum aggregation: 3633 ARIN Deaggregation factor: 1.69 Prefixes being announced from the ARIN address blocks: 6171 Unique aggregates announced from the ARIN address blocks: 4163 ARIN Region origin ASes present in the Internet Routing Table: 974 ARIN Prefixes per ASN: 6.34 ARIN Region origin ASes announcing only one prefix: 350 ARIN Region transit ASes present in the Internet Routing Table: 121 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: 160 Number of ARIN addresses announced to Internet: 67285120 Equivalent to 4 /8s, 2 /16s and 176 /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, 393216-404380 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: 3149 Total RIPE prefixes after maximum aggregation: 2587 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3133 Unique aggregates announced from the RIPE address blocks: 2665 RIPE Region origin ASes present in the Internet Routing Table: 565 RIPE Prefixes per ASN: 5.55 RIPE Region origin ASes announcing only one prefix: 253 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: 141 Number of RIPE addresses announced to Internet: 55637888 Equivalent to 3 /8s, 80 /16s and 247 /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: 525 Total LACNIC prefixes after maximum aggregation: 264 LACNIC Deaggregation factor: 1.99 Prefixes being announced from the LACNIC address blocks: 521 Unique aggregates announced from the LACNIC address blocks: 456 LACNIC Region origin ASes present in the Internet Routing Table: 42 LACNIC Prefixes per ASN: 12.40 LACNIC Region origin ASes announcing only one prefix: 20 LACNIC Region transit ASes present in the Internet Routing Table: 13 Average LACNIC Region AS path length visible: 4.3 Max LACNIC Region AS path length visible: 9 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 13 Number of LACNIC addresses announced to Internet: 921440 Equivalent to 0 /8s, 14 /16s and 15 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-275868 + 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: 329 Total AfriNIC prefixes after maximum aggregation: 83 AfriNIC Deaggregation factor: 3.96 Prefixes being announced from the AfriNIC address blocks: 334 Unique aggregates announced from the AfriNIC address blocks: 143 AfriNIC Region origin ASes present in the Internet Routing Table: 31 AfriNIC Prefixes per ASN: 10.77 AfriNIC Region origin ASes announcing only one prefix: 18 AfriNIC Region transit ASes present in the Internet Routing Table: 8 Average AfriNIC Region AS path length visible: 5.0 Max AfriNIC Region AS path length visible: 10 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 17 Number of AfriNIC addresses announced to Internet: 614656 Equivalent to 0 /8s, 9 /16s and 97 /24s AfriNIC AS Blocks 36864-37887, 327680-330751 & 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 612 2153 465 SINET-AS Research Organization of Informa 7497 465 212 24 CSTNET-AS-AP Computer Network Information 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 179 4190 71 ERX-CERNET-BKB China Education and Resear 7575 166 281 113 AARNET-AS-AP Australian Academic and Rese 55824 151 19 20 NKN-CORE-NW NKN Core Network, IN 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 1659 57 938 33 ERX-TANET-ASN1 Taiwan Academic Network TA 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 197 16 1 UPRENET - University of Puerto Rico, PR 376 195 146 149 RISQ-AS - Reseau dInformations Scientifiq 2920 173 34 7 LACOE - Los Angeles County Office of Educ 2152 146 491 96 CENIC-2152 - CENIC, US 18558 140 18 4 NETBLK-RCOEK - Riverside County Office of 21976 92 34 14 NJEDGE-NET - NJEDge.Net, Inc., US 1736 79 16 1 MU-AS - Marquette University, US 22742 70 37 32 CT-EDU-NET - Connecticut Education Networ 81 69 241 26 NCREN - MCNC, US 271 68 26 53 BCNET-AS - BCNET, CA 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 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 786 210 1684 192 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 1103 99 1503 84 SURFNET-NL SURFnet, The Netherlands, NL 2614 87 26 67 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 78 88 73 RCCN Fundacao para a Ciencia e a Tecnolog 2200 63 614 58 FR-RENATER Reseau National de telecommuni 200521 58 4 24 SEAP-AGE, ES 1653 52 150 49 SUNET SUNET Swedish University Network, E 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 263 52 133 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 49 Red Universitaria Nacional, CL 61468 43 3 22 CEDIA, EC 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28027 12 1 7 Escuela Superior Politecnica del Litoral, 278 11 32 2 Universidad Nacional Autonoma de Mexico, 262441 4 4 3 Fund. Vale do Taquari de Educ. e Desenvol 3596 3 0 3 Universidad Autonoma Metropolitana, MX 27676 3 0 3 ALMA - Atacama Large Millimeter Array, CL 27922 3 1 3 Smithsonian Tropical Research Institute, 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 119 82 3 KENET-AS, KE 2561 68 4 34 EUN, EG 37215 45 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 327700 13 16 1 MoRENet, MZ 30983 12 4 2 MARWAN-AS, MA 37182 10 8 1 TERNET, TZ 37654 8 1 6 RwEdNet-AS, RW 327798 4 0 3 BERNET, BI 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 612 2153 465 SINET-AS Research Organization of Informa 7497 465 212 24 CSTNET-AS-AP Computer Network Information 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 1916 263 52 133 Rede Nacional de Ensino e Pesquisa, BR 786 210 1684 192 JANET Jisc Services Limited, GB 5786 197 16 1 UPRENET - University of Puerto Rico, PR 376 195 146 149 RISQ-AS - Reseau dInformations Scientifiq 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 179 4190 71 ERX-CERNET-BKB China Education and Resear 2920 173 34 7 LACOE - Los Angeles County Office of Educ 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 465 441 CSTNET-AS-AP Computer Network Information Cente 5786 197 196 UPRENET - University of Puerto Rico, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 173 166 LACOE - Los Angeles County Office of Education, 18558 140 136 NETBLK-RCOEK - Riverside County Office of Educa 55824 151 131 NKN-CORE-NW NKN Core Network, IN 1916 263 130 Rede Nacional de Ensino e Pesquisa, BR 36914 119 116 KENET-AS, KE 4538 179 108 ERX-CERNET-BKB China Education and Research Net 21976 92 78 NJEDGE-NET - NJEDge.Net, Inc., 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 401367 UNALLOCATED 216.186.25.0/24 10430 WA-K20 - Washington Sta Complete listing at https://bgp.nsrc.org/REN/ASREN/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP Adelaide Unive 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 /12:10 /13:16 /14:30 /15:100 /16:1611 /17:293 /18:321 /19:419 /20:585 /21:654 /22:1033 /23:1157 /24:7109 /25:55 /26:80 /27:40 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 104 119 KENET-AS, KE 1916 88 263 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 39 45 MAREN, MW 200521 34 58 SEAP-AGE, ES 27609 29 45 USC-UNIVERSITY-HOSPITAL - USC-University Hospital, US 36794 24 26 META SOLUTIONS PIKETON - META Solutions, US 61468 23 43 CEDIA, EC 22742 20 70 CT-EDU-NET - Connecticut Education Network, US 47623 18 22 IIAP-ASNET-AS, AM Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:19 6:5 8:2 12:1 14:95 23:5 24:1 31:1 35:1 37:26 38:3 40:1 41:96 42:17 44:6 45:21 46:4 47:1 49:13 50:1 58:12 59:17 60:6 61:3 62:5 63:32 64:28 65:3 66:28 67:4 68:9 69:13 70:2 72:5 74:18 76:19 77:4 78:3 79:5 80:5 81:26 82:3 83:7 84:6 85:26 86:1 87:1 89:17 91:31 93:14 94:2 95:1 96:5 98:2 101:4 102:4 103:250 104:71 108:7 109:3 111:3 114:3 116:7 117:2 118:32 119:35 121:17 122:8 123:8 124:42 128:53 129:37 130:100 131:44 132:52 133:157 134:84 136:190 137:53 138:9 139:4 140:30 141:6 142:29 143:14 144:4 145:13 146:121 147:16 148:9 149:11 150:9 151:6 152:60 153:8 154:12 155:27 156:123 157:6 158:27 159:112 160:33 161:10 162:18 163:78 164:10 165:5 167:12 168:37 169:6 170:10 172:1 173:5 175:10 177:1 179:3 180:15 184:6 185:34 187:8 188:22 190:14 191:1 192:1197 193:288 194:93 195:86 196:12 197:63 198:357 199:214 200:180 201:4 202:353 203:184 204:329 205:94 206:171 207:200 208:21 209:71 210:108 211:1 212:42 213:4 214:1 216:53 217:22 219:6 220:3 222:2 223:6 End of report