IPv4 R&E Routing Table Report 17:05 GMT Fri 01 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: 13370 Prefixes after maximum aggregation (per Origin AS): 8216 Deaggregation factor: 1.63 Unique aggregates announced (without unneeded subnets): 9134 Number of IPv4 prefixes with a valid ROA: 5894 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7475 Total ASes present in the Internet Routing Table: 2081 Prefixes per ASN: 6.42 Origin-only ASes present in the Internet Routing Table: 1798 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: 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: 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: 49582 Number of 32-bit ASNs visible in the Routing Table: 533 Prefixes from 32-bit ASNs in the Routing Table: 1370 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: 165120704 Equivalent to 9 /8s, 215 /16s and 138 /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: 1292 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3358 Total APNIC prefixes after maximum aggregation: 1722 APNIC Deaggregation factor: 1.95 Prefixes being announced from the APNIC address blocks: 3359 Unique aggregates announced from the APNIC address blocks: 1835 APNIC Region origin ASes present in the Internet Routing Table: 450 APNIC Prefixes per ASN: 7.46 APNIC Region origin ASes announcing only one prefix: 208 APNIC Region transit ASes present in the Internet Routing Table: 41 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: 198 Number of APNIC addresses announced to Internet: 41008448 Equivalent to 2 /8s, 113 /16s and 189 /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: 5971 Total ARIN prefixes after maximum aggregation: 3508 ARIN Deaggregation factor: 1.70 Prefixes being announced from the ARIN address blocks: 5985 Unique aggregates announced from the ARIN address blocks: 3998 ARIN Region origin ASes present in the Internet Routing Table: 940 ARIN Prefixes per ASN: 6.37 ARIN Region origin ASes announcing only one prefix: 343 ARIN Region transit ASes present in the Internet Routing Table: 122 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: 159 Number of ARIN addresses announced to Internet: 66433696 Equivalent to 3 /8s, 245 /16s and 178 /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: 3193 Total RIPE prefixes after maximum aggregation: 2630 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3177 Unique aggregates announced from the RIPE address blocks: 2690 RIPE Region origin ASes present in the Internet Routing Table: 568 RIPE Prefixes per ASN: 5.59 RIPE Region origin ASes announcing only one prefix: 254 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: 13 Number of RIPE region 32-bit ASNs visible in the Routing Table: 142 Number of RIPE addresses announced to Internet: 56091008 Equivalent to 3 /8s, 87 /16s and 225 /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: 543 Total LACNIC prefixes after maximum aggregation: 276 LACNIC Deaggregation factor: 1.97 Prefixes being announced from the LACNIC address blocks: 539 Unique aggregates announced from the LACNIC address blocks: 469 LACNIC Region origin ASes present in the Internet Routing Table: 48 LACNIC Prefixes per ASN: 11.23 LACNIC Region origin ASes announcing only one prefix: 25 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: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 18 Number of LACNIC addresses announced to Internet: 981344 Equivalent to 0 /8s, 14 /16s and 249 /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: 304 Total AfriNIC prefixes after maximum aggregation: 79 AfriNIC Deaggregation factor: 3.85 Prefixes being announced from the AfriNIC address blocks: 309 Unique aggregates announced from the AfriNIC address blocks: 141 AfriNIC Region origin ASes present in the Internet Routing Table: 29 AfriNIC Prefixes per ASN: 10.66 AfriNIC Region origin ASes announcing only one prefix: 17 AfriNIC Region transit ASes present in the Internet Routing Table: 8 Average AfriNIC Region AS path length visible: 4.9 Max AfriNIC Region AS path length visible: 10 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 16 Number of AfriNIC addresses announced to Internet: 605952 Equivalent to 0 /8s, 9 /16s and 63 /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 611 2153 464 SINET-AS Research Organization of Informa 7497 458 212 24 CSTNET-AS-AP Computer Network Information 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 175 4190 71 ERX-CERNET-BKB China Education and Resear 7575 166 281 113 AARNET-AS-AP Australian Academic and Rese 55824 152 19 21 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 376 194 162 148 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 81 73 305 29 NCREN - MCNC, US 22742 70 37 32 CT-EDU-NET - Connecticut Education Networ 3477 68 78 30 NOAA-NWAVE - National Oceanic and Atmosph 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 1708 187 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 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 64 630 59 FR-RENATER Reseau National de telecommuni 200521 56 4 28 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 263 52 133 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 49 Red Universitaria Nacional, CL 61468 42 3 21 CEDIA, EC 20191 26 16 1 Pontificia Universidad Catolica de Chile, 278 12 32 4 Universidad Nacional Autonoma de Mexico, 28027 12 1 7 Escuela Superior Politecnica del Litoral, 262742 8 2 1 Fundacao Universidade Federal do ABC - UF 52888 7 1 5 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 262441 4 4 3 Fund. Vale do Taquari de Educ. e Desenvol 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 100 82 3 KENET-AS, KE 2561 68 4 34 EUN, EG 37215 45 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 327700 11 16 1 MoRENet, MZ 37182 9 8 1 TERNET, TZ 37654 9 1 5 RwEdNet-AS, RW 327798 3 0 2 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 611 2153 464 SINET-AS Research Organization of Informa 7497 458 212 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 1708 187 JANET Jisc Services Limited, GB 5786 197 16 1 UPRENET - University of Puerto Rico, PR 376 194 162 148 RISQ-AS - Reseau dInformations Scientifiq 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 175 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 458 434 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 152 131 NKN-CORE-NW NKN Core Network, IN 1916 263 130 Rede Nacional de Ensino e Pesquisa, BR 4538 175 104 ERX-CERNET-BKB China Education and Research Net 36914 100 97 KENET-AS, KE 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 /16:1605 /17:300 /18:310 /19:409 /20:578 /21:647 /22:1031 /23:1126 /24:7030 /25:55 /26:80 /27:41 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 1916 88 263 Rede Nacional de Ensino e Pesquisa, BR 36914 85 100 KENET-AS, KE 31638 48 48 ASN-LEPIDA, IT 37215 39 45 MAREN, MW 200521 32 56 SEAP-AGE, ES 27609 29 45 USC-UNIVERSITY-HOSPITAL - USC-University Hospital, US 36794 24 26 META SOLUTIONS PIKETON - META Solutions, US 61468 23 42 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 5:18 6:5 8:2 12:1 14:95 23:4 24:1 31:1 35:1 37:26 38:3 40:1 41:77 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 64:32 65:3 66:26 67:4 68:9 69:13 70:2 72:5 74:18 76:18 77:4 78:3 79:5 80:5 81:27 82:3 83:7 84:6 85:26 86:1 87:1 89:17 91:32 93:14 94:2 95:2 96:5 98:2 101:4 102:3 103:268 104:70 108:7 109:2 111:3 114:3 116:7 117:2 118:32 119:26 121:16 122:8 123:8 124:42 128:55 129:36 130:99 131:49 132:51 133:157 134:84 136:190 137:52 138:9 139:4 140:30 141:4 142:23 143:16 144:4 145:13 146:121 147:16 148:8 149:11 150:9 151:6 152:61 153:13 154:12 155:27 156:123 157:7 158:27 159:112 160:33 161:7 162:18 163:78 164:10 165:5 167:12 168:37 169:6 170:11 173:5 175:10 177:1 179:3 180:15 182:1 184:6 185:35 187:8 188:22 190:14 191:1 192:1171 193:288 194:92 195:87 196:11 197:61 198:349 199:194 200:183 201:4 202:352 203:186 204:329 205:83 206:170 207:197 208:21 209:74 210:109 211:1 212:41 213:4 216:50 217:22 219:6 220:3 222:2 223:6 End of report