IPv4 R&E Routing Table Report 17:05 GMT Thu 02 Apr, 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: 13696 Prefixes after maximum aggregation (per Origin AS): 8268 Deaggregation factor: 1.66 Unique aggregates announced (without unneeded subnets): 9196 Number of IPv4 prefixes with a valid ROA: 6147 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7548 Total ASes present in the Internet Routing Table: 2128 Prefixes per ASN: 6.44 Origin-only ASes present in the Internet Routing Table: 1843 Origin ASes announcing only one prefix: 869 Transit ASes present in the Internet Routing Table: 285 Transit-only ASes present in the Internet Routing Table: 39 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: 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: 49189 Number of 32-bit ASNs visible in the Routing Table: 546 Prefixes from 32-bit ASNs in the Routing Table: 1411 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: 166648864 Equivalent to 9 /8s, 238 /16s and 220 /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: 1469 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3339 Total APNIC prefixes after maximum aggregation: 1709 APNIC Deaggregation factor: 1.95 Prefixes being announced from the APNIC address blocks: 3340 Unique aggregates announced from the APNIC address blocks: 1825 APNIC Region origin ASes present in the Internet Routing Table: 454 APNIC Prefixes per ASN: 7.36 APNIC Region origin ASes announcing only one prefix: 211 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: 204 Number of APNIC addresses announced to Internet: 40898112 Equivalent to 2 /8s, 112 /16s and 14 /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: 6146 Total ARIN prefixes after maximum aggregation: 3567 ARIN Deaggregation factor: 1.72 Prefixes being announced from the ARIN address blocks: 6158 Unique aggregates announced from the ARIN address blocks: 4056 ARIN Region origin ASes present in the Internet Routing Table: 978 ARIN Prefixes per ASN: 6.30 ARIN Region origin ASes announcing only one prefix: 354 ARIN Region transit ASes present in the Internet Routing Table: 120 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: 165 Number of ARIN addresses announced to Internet: 67938080 Equivalent to 4 /8s, 12 /16s and 167 /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: 3197 Total RIPE prefixes after maximum aggregation: 2633 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3182 Unique aggregates announced from the RIPE address blocks: 2707 RIPE Region origin ASes present in the Internet Routing Table: 572 RIPE Prefixes per ASN: 5.56 RIPE Region origin ASes announcing only one prefix: 259 RIPE Region transit ASes present in the Internet Routing Table: 95 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: 143 Number of RIPE addresses announced to Internet: 56172032 Equivalent to 3 /8s, 89 /16s and 30 /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: 564 Total LACNIC prefixes after maximum aggregation: 275 LACNIC Deaggregation factor: 2.05 Prefixes being announced from the LACNIC address blocks: 560 Unique aggregates announced from the LACNIC address blocks: 459 LACNIC Region origin ASes present in the Internet Routing Table: 54 LACNIC Prefixes per ASN: 10.37 LACNIC Region origin ASes announcing only one prefix: 27 LACNIC Region transit ASes present in the Internet Routing Table: 15 Average LACNIC Region AS path length visible: 4.4 Max LACNIC Region AS path length visible: 9 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 19 Number of LACNIC addresses announced to Internet: 1012416 Equivalent to 0 /8s, 15 /16s and 114 /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: 449 Total AfriNIC prefixes after maximum aggregation: 83 AfriNIC Deaggregation factor: 5.41 Prefixes being announced from the AfriNIC address blocks: 454 Unique aggregates announced from the AfriNIC address blocks: 147 AfriNIC Region origin ASes present in the Internet Routing Table: 30 AfriNIC Prefixes per ASN: 15.13 AfriNIC Region origin ASes announcing only one prefix: 18 AfriNIC Region transit ASes present in the Internet Routing Table: 9 Average AfriNIC Region AS path length visible: 5.5 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 15 Number of AfriNIC addresses announced to Internet: 625920 Equivalent to 0 /8s, 9 /16s and 141 /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 454 180 23 CSTNET-AS-AP Computer Network Information 4538 182 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 165 281 112 AARNET-AS-AP Australian Academic and Rese 55824 153 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 2920 173 34 7 LACOE - Los Angeles County Office of Educ 2152 147 491 96 CENIC-2152 - CENIC, US 18558 140 18 4 NETBLK-RCOEK - Riverside County Office of 376 136 123 101 RISQ-AS - Reseau dInformations Scientifiq 21976 92 34 14 NJEDGE-NET - NJEDge.Net, Inc., US 1736 79 16 1 MU-AS - Marquette University, US 81 71 268 24 NCREN - MCNC, US 22742 70 37 32 CT-EDU-NET - Connecticut Education Networ 10430 68 143 63 WA-K20 - Washington State K-20 Telecommun 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 1731 188 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 57 4 25 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 248 51 126 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 49 Red Universitaria Nacional, CL 61468 45 3 23 CEDIA, EC 20191 26 16 1 Pontificia Universidad Catolica de Chile, 21612 15 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 278 13 32 3 Universidad Nacional Autonoma de Mexico, 28027 12 1 7 Escuela Superior Politecnica del Litoral, 262742 8 2 1 Fundacao Universidade Federal do ABC - UF 52750 5 1 1 Fundacao Centros de Ref. em Tecnologias I 61612 5 16 1 DEPARTAMENTO DE CIENCIA E TECNOLOGIA AERO 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 242 82 3 KENET-AS, KE 2561 68 4 34 EUN, EG 37215 44 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 327700 11 16 1 MoRENet, MZ 37182 10 8 1 TERNET, TZ 37654 9 1 5 RwEdNet-AS, RW 327798 4 0 3 BERNET, BI 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 612 2153 465 SINET-AS Research Organization of Informa 7497 454 180 23 CSTNET-AS-AP Computer Network Information 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 1916 248 51 126 Rede Nacional de Ensino e Pesquisa, BR 36914 242 82 3 KENET-AS, KE 786 210 1731 188 JANET Jisc Services Limited, GB 5786 197 16 1 UPRENET - University of Puerto Rico, PR 4538 182 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 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 454 431 CSTNET-AS-AP Computer Network Information Cente 36914 242 239 KENET-AS, KE 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 153 132 NKN-CORE-NW NKN Core Network, IN 1916 248 122 Rede Nacional de Ensino e Pesquisa, BR 4538 182 110 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 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 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 /15:99 /16:1624 /17:313 /18:327 /19:436 /20:592 /21:664 /22:1033 /23:1127 /24:7243 /25:56 /26:79 /27:45 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 225 242 KENET-AS, KE 1916 87 248 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 38 44 MAREN, MW 200521 33 57 SEAP-AGE, ES 32440 32 47 LONI - Louisiana Board of RegentsLouisiana Optical Network Initiative LONI, US 27609 29 45 USC-UNIVERSITY-HOSPITAL - USC-University Hospital, US 36794 24 26 META SOLUTIONS PIKETON - META Solutions, US 61468 23 45 CEDIA, EC 22742 20 70 CT-EDU-NET - Connecticut Education Network, US 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 14:96 23:5 24:1 31:1 35:1 37:26 38:3 40:1 41:95 42:16 44:6 45:21 46:4 47:1 49:13 58:13 59:17 60:6 61:3 62:5 63:32 64:35 65:1 66:28 67:4 68:10 69:12 70:2 72:5 74:17 76:28 77:4 78:3 79:5 80:5 81:27 82:3 83:6 84:6 85:26 86:1 87:1 89:17 91:34 93:14 94:2 95:2 96:5 98:2 101:4 102:2 103:279 104:72 108:6 109:2 110:1 111:3 114:1 116:7 118:32 119:26 121:16 122:8 123:8 124:42 128:54 129:38 130:99 131:50 132:53 133:157 134:84 136:189 137:53 138:9 139:4 140:30 141:2 142:26 143:16 144:4 145:4 146:122 147:16 148:8 149:11 150:26 151:8 152:63 153:13 154:13 155:25 156:123 157:17 158:27 159:110 160:33 161:9 162:19 163:77 164:11 165:5 167:14 168:14 169:6 170:12 172:1 173:5 175:1 177:3 179:7 180:15 182:2 184:6 185:38 186:1 187:8 188:22 190:14 191:1 192:1215 193:296 194:92 195:87 196:11 197:183 198:345 199:211 200:168 201:4 202:350 203:185 204:322 205:80 206:165 207:198 208:23 209:78 210:107 211:1 212:41 213:4 216:53 217:22 219:6 220:3 222:2 223:6 End of report