IPv4 R&E Routing Table Report 22:05 GMT Sat 31 Jan, 2026 IPv4 BGP Table (R&E) as seen at CENIC. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/CENIC/ Analysis Summary ---------------- BGP routing table entries examined: 19750 Prefixes after maximum aggregation (per Origin AS): 11388 Deaggregation factor: 1.73 Unique aggregates announced (without unneeded subnets): 12712 Number of IPv4 prefixes with a valid ROA: 9067 Number of IPv4 prefixes with an invalid ROA: 11 Number of IPv4 prefixes with no ROA: 10672 Total ASes present in the Internet Routing Table: 2716 Prefixes per ASN: 7.27 Origin-only ASes present in the Internet Routing Table: 2350 Origin ASes announcing only one prefix: 1059 Transit ASes present in the Internet Routing Table: 366 Transit-only ASes present in the Internet Routing Table: 56 Paths with bogon ASNs present in the IPv4 Routing Table: 5 Average AS path length visible in the Internet Routing Table: 4.0 Max AS path length visible: 15 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 14 Number of instances of unregistered ASNs: 14 Number of 32-bit ASNs allocated by the RIRs: 48540 Number of 32-bit ASNs visible in the Routing Table: 675 Prefixes from 32-bit ASNs in the Routing Table: 1890 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: 4 Number of addresses announced to Internet: 268864000 Equivalent to 16 /8s, 6 /16s and 138 /24s Percentage of available address space announced: 7.3 Percentage of allocated address space announced: 7.3 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: 2338 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4635 Total APNIC prefixes after maximum aggregation: 2263 APNIC Deaggregation factor: 2.05 Prefixes being announced from the APNIC address blocks: 4727 Unique aggregates announced from the APNIC address blocks: 2582 APNIC Region origin ASes present in the Internet Routing Table: 565 APNIC Prefixes per ASN: 8.37 APNIC Region origin ASes announcing only one prefix: 250 APNIC Region transit ASes present in the Internet Routing Table: 52 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: 215 Number of APNIC addresses announced to Internet: 47101440 Equivalent to 2 /8s, 206 /16s and 182 /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: 9295 Total ARIN prefixes after maximum aggregation: 5768 ARIN Deaggregation factor: 1.61 Prefixes being announced from the ARIN address blocks: 8840 Unique aggregates announced from the ARIN address blocks: 6048 ARIN Region origin ASes present in the Internet Routing Table: 1317 ARIN Prefixes per ASN: 6.71 ARIN Region origin ASes announcing only one prefix: 461 ARIN Region transit ASes present in the Internet Routing Table: 165 Average ARIN Region AS path length visible: 3.6 Max ARIN Region AS path length visible: 15 Number of ARIN region 32-bit ASNs visible in the Routing Table: 225 Number of ARIN addresses announced to Internet: 135065856 Equivalent to 8 /8s, 12 /16s and 241 /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: 3382 Total RIPE prefixes after maximum aggregation: 2672 RIPE Deaggregation factor: 1.27 Prefixes being announced from the RIPE address blocks: 3748 Unique aggregates announced from the RIPE address blocks: 3132 RIPE Region origin ASes present in the Internet Routing Table: 598 RIPE Prefixes per ASN: 6.27 RIPE Region origin ASes announcing only one prefix: 270 RIPE Region transit ASes present in the Internet Routing Table: 101 Average RIPE Region AS path length visible: 4.6 Max RIPE Region AS path length visible: 14 Number of RIPE region 32-bit ASNs visible in the Routing Table: 152 Number of RIPE addresses announced to Internet: 79775488 Equivalent to 4 /8s, 193 /16s and 71 /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: 1201 Total LACNIC prefixes after maximum aggregation: 477 LACNIC Deaggregation factor: 2.52 Prefixes being announced from the LACNIC address blocks: 1204 Unique aggregates announced from the LACNIC address blocks: 658 LACNIC Region origin ASes present in the Internet Routing Table: 130 LACNIC Prefixes per ASN: 9.26 LACNIC Region origin ASes announcing only one prefix: 57 LACNIC Region transit ASes present in the Internet Routing Table: 23 Average LACNIC Region AS path length visible: 5.0 Max LACNIC Region AS path length visible: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 59 Number of LACNIC addresses announced to Internet: 4311040 Equivalent to 0 /8s, 65 /16s and 200 /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: 1223 Total AfriNIC prefixes after maximum aggregation: 202 AfriNIC Deaggregation factor: 6.05 Prefixes being announced from the AfriNIC address blocks: 1227 Unique aggregates announced from the AfriNIC address blocks: 288 AfriNIC Region origin ASes present in the Internet Routing Table: 46 AfriNIC Prefixes per ASN: 26.67 AfriNIC Region origin ASes announcing only one prefix: 21 AfriNIC Region transit ASes present in the Internet Routing Table: 12 Average AfriNIC Region AS path length visible: 3.2 Max AfriNIC Region AS path length visible: 6 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 24 Number of AfriNIC addresses announced to Internet: 2607360 Equivalent to 0 /8s, 39 /16s and 201 /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 600 2169 462 SINET-AS Research Organization of Informa 7497 454 180 23 CSTNET-AS-AP Computer Network Information 1237 199 72 153 KREONET-AS-KR KISTI, KR 4538 184 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 164 281 111 AARNET-AS-AP Australian Academic and Rese 55824 153 19 21 NKN-CORE-NW NKN Core Network, IN 4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 1659 61 1466 35 ERX-TANET-ASN1 Taiwan Academic Network TA Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 8075 908 16034 746 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft C 376 196 162 151 RISQ-AS - Reseau dInformations Scientifiq 5786 196 16 1 UPRENET - University of Puerto Rico, PR 668 177 581 152 DNIC-AS-00668 - United States Department 2920 176 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 270 134 394 90 AS270 - National Aeronautics and Space Ad 81 117 455 35 NCREN - MCNC, US 21976 94 34 16 NJEDGE-NET - NJEDge.Net, Inc., US Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 292 1883 253 DFN Verein zur Foerderung eines Deutschen 786 211 1735 187 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 8895 103 24 5 ISU Internet Services Unit ISU, SA 1103 100 1759 85 SURFNET-NL SURFnet, The Netherlands, NL 2614 88 26 68 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 Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 205 177 41 Rede Nacional de Ensino e Pesquisa, BR 28391 161 10 72 Universidad Juarez Autonoma de Tabasco, M 11340 111 25 50 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 57 84 39 Fundacao Carlos Chagas Filho de Amparo a 19611 53 17 2 Associacao Antonio Vieira - Unisinos, BR 61468 52 3 21 CEDIA, EC 28614 38 2 2 Fundacao Universidade Regional de Blumena 1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 3596 37 8 4 Universidad Autonoma Metropolitana, MX Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 564 82 3 KENET-AS, KE 2018 374 318 69 TENET-1, ZA 2561 68 4 34 EUN, EG 8094 47 48 18 PUKNET, ZA 37215 44 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 327700 14 16 1 MoRENet, MZ 37501 11 49 6 UOFS, ZA 36982 8 33 8 UCT, ZA 37654 7 0 5 RwEdNet-AS, RW Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 8075 908 16034 746 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft C 2907 600 2169 462 SINET-AS Research Organization of Informa 36914 564 82 3 KENET-AS, KE 7497 454 180 23 CSTNET-AS-AP Computer Network Information 2018 374 318 69 TENET-1, ZA 680 292 1883 253 DFN Verein zur Foerderung eines Deutschen 786 211 1735 187 JANET Jisc Services Limited, GB 1916 205 177 41 Rede Nacional de Ensino e Pesquisa, BR 1237 199 72 153 KREONET-AS-KR KISTI, KR 376 196 162 151 RISQ-AS - Reseau dInformations Scientifiq Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 564 561 KENET-AS, KE 7497 454 431 CSTNET-AS-AP Computer Network Information Cente 2018 374 305 TENET-1, ZA 5786 196 195 UPRENET - University of Puerto Rico, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE - Los Angeles County Office of Education, 1916 205 164 Rede Nacional de Ensino e Pesquisa, BR 2907 600 138 SINET-AS Research Organization of Information a 18558 140 136 NETBLK-RCOEK - Riverside County Office of Educa 55824 153 132 NKN-CORE-NW NKN Core Network, IN Complete listing at https://bgp.nsrc.org/REN/CENIC/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 65208 PRIVATE 63.225.1.0/24 11570 AS11570 - Eastern New M 26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276 - University 64011 UNALLOCATED 130.215.0.0/16 10326 WPI - Worcester Polytec 396334 UNALLOCATED 205.143.136.0/21 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.136.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.137.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.138.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.139.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.140.0/24 5078 ONENET-AS-1 - Oklahoma 396334 UNALLOCATED 205.143.141.0/24 5078 ONENET-AS-1 - Oklahoma Complete listing at https://bgp.nsrc.org/REN/CENIC/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 162.212.34.0/24 Origin: 54048 CVIN - Vast Networks, US 162.212.34.0/24 Transit: 2152 CENIC-2152 - CENIC, US 164.160.192.0/21 Origin: 37661 NRaE1-AS, NG 164.160.192.0/21 Transit: 37288 WACREN, SN 202.14.117.0/24 Origin: 17827 STOU-AS-TH Sukhothai Thammathirat Open U 202.14.117.0/24 Transit: 4621 UNINET-AS-AP UNINET-, TH 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/CENIC/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 /10:3 /11:7 /12:25 /13:31 /14:61 /15:154 /16:2185 /17:442 /18:475 /19:610 /20:835 /21:901 /22:1417 /23:1550 /24:11053 /25:0 /26:0 /27:0 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 540 564 KENET-AS, KE 8075 181 908 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US 8895 100 103 ISU Internet Services Unit ISU, SA 31638 48 48 ASN-LEPIDA, IT 37215 38 44 MAREN, MW 200521 34 59 SEAP-AGE, ES 28614 32 38 Fundacao Universidade Regional de Blumenau, BR 46115 32 35 LUTHER - Luther College, US 25977 30 44 HCCS - HOUSTON COMMUNITY COLLEGE SYSTEM, US 27609 29 45 USC-UNIVERSITY-HOSPITAL - USC-University Hospital, US Complete listing at https://bgp.nsrc.org/REN/CENIC/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 2:1 4:2 5:20 6:1 8:13 12:2 13:35 14:96 20:21 23:12 24:2 31:4 35:10 37:28 38:12 40:2 41:234 42:17 44:6 45:45 46:5 47:1 49:13 50:6 52:5 58:14 59:20 60:6 61:3 62:19 63:34 64:56 65:6 66:69 67:45 68:17 69:28 70:4 72:6 74:60 76:27 77:7 78:3 79:10 80:7 81:28 82:3 83:7 84:5 85:26 86:4 87:1 89:17 91:43 92:3 93:14 94:8 95:2 96:5 97:2 98:2 101:4 102:11 103:304 104:82 108:11 109:10 111:4 113:6 114:24 115:1 116:9 117:6 118:33 119:23 121:17 122:8 123:8 124:42 125:3 128:58 129:42 130:102 131:74 132:50 133:157 134:120 135:6 136:197 137:65 138:18 139:5 140:34 141:6 142:39 143:28 144:13 145:22 146:139 147:46 148:206 149:11 150:40 151:20 152:131 153:17 154:37 155:99 156:127 157:27 158:28 159:119 160:35 161:45 162:32 163:80 164:16 165:53 166:3 167:31 168:103 169:7 170:34 171:1 172:1 173:6 175:15 176:1 177:7 178:4 179:12 180:16 181:1 182:2 184:6 185:76 186:4 187:24 188:25 190:17 191:13 192:1583 193:309 194:119 195:94 196:149 197:347 198:495 199:315 200:298 201:22 202:593 203:454 204:400 205:133 206:214 207:217 208:58 209:106 210:226 211:4 212:145 213:9 214:9 216:101 217:25 218:20 219:6 220:16 222:4 223:17 End of report