IPv4 R&E Routing Table Report 22:20 GMT Fri 12 Jun, 2026 IPv4 BGP Table (R&E) as seen at ESnet. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/ESnet/ Analysis Summary ---------------- BGP routing table entries examined: 18787 Prefixes after maximum aggregation (per Origin AS): 10252 Deaggregation factor: 1.83 Unique aggregates announced (without unneeded subnets): 11350 Number of IPv4 prefixes with a valid ROA: 8830 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 9956 Total ASes present in the Internet Routing Table: 2638 Prefixes per ASN: 7.12 Origin-only ASes present in the Internet Routing Table: 2297 Origin ASes announcing only one prefix: 1008 Transit ASes present in the Internet Routing Table: 341 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: 4.0 Max AS path length visible: 45 Max AS path prepend of ASN ( 30075) 41 Prefixes from unregistered ASNs in the Routing Table: 3 Number of instances of unregistered ASNs: 3 Number of 32-bit ASNs allocated by the RIRs: 50095 Number of 32-bit ASNs visible in the Routing Table: 673 Prefixes from 32-bit ASNs in the Routing Table: 1895 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: 166173696 Equivalent to 9 /8s, 231 /16s and 156 /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: 2171 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4591 Total APNIC prefixes after maximum aggregation: 2260 APNIC Deaggregation factor: 2.03 Prefixes being announced from the APNIC address blocks: 4590 Unique aggregates announced from the APNIC address blocks: 2536 APNIC Region origin ASes present in the Internet Routing Table: 571 APNIC Prefixes per ASN: 8.04 APNIC Region origin ASes announcing only one prefix: 237 APNIC Region transit ASes present in the Internet Routing Table: 49 Average APNIC Region AS path length visible: 3.9 Max APNIC Region AS path length visible: 15 Number of APNIC region 32-bit ASNs visible in the Routing Table: 230 Number of APNIC addresses announced to Internet: 35704320 Equivalent to 2 /8s, 32 /16s and 206 /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: 8641 Total ARIN prefixes after maximum aggregation: 4740 ARIN Deaggregation factor: 1.82 Prefixes being announced from the ARIN address blocks: 8655 Unique aggregates announced from the ARIN address blocks: 5324 ARIN Region origin ASes present in the Internet Routing Table: 1271 ARIN Prefixes per ASN: 6.81 ARIN Region origin ASes announcing only one prefix: 438 ARIN Region transit ASes present in the Internet Routing Table: 150 Average ARIN Region AS path length visible: 4.1 Max ARIN Region AS path length visible: 45 Number of ARIN region 32-bit ASNs visible in the Routing Table: 223 Number of ARIN addresses announced to Internet: 71698944 Equivalent to 4 /8s, 70 /16s and 10 /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: 3319 Total RIPE prefixes after maximum aggregation: 2664 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3309 Unique aggregates announced from the RIPE address blocks: 2743 RIPE Region origin ASes present in the Internet Routing Table: 593 RIPE Prefixes per ASN: 5.58 RIPE Region origin ASes announcing only one prefix: 272 RIPE Region transit ASes present in the Internet Routing Table: 99 Average RIPE Region AS path length visible: 3.6 Max RIPE Region AS path length visible: 13 Number of RIPE region 32-bit ASNs visible in the Routing Table: 151 Number of RIPE addresses announced to Internet: 52566784 Equivalent to 3 /8s, 34 /16s and 27 /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 196608-219547 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: 1045 Total LACNIC prefixes after maximum aggregation: 388 LACNIC Deaggregation factor: 2.69 Prefixes being announced from the LACNIC address blocks: 1044 Unique aggregates announced from the LACNIC address blocks: 469 LACNIC Region origin ASes present in the Internet Routing Table: 115 LACNIC Prefixes per ASN: 9.08 LACNIC Region origin ASes announcing only one prefix: 43 LACNIC Region transit ASes present in the Internet Routing Table: 21 Average LACNIC Region AS path length visible: 4.2 Max LACNIC Region AS path length visible: 9 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 52 Number of LACNIC addresses announced to Internet: 3739648 Equivalent to 0 /8s, 57 /16s and 16 /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: 1188 Total AfriNIC prefixes after maximum aggregation: 197 AfriNIC Deaggregation factor: 6.03 Prefixes being announced from the AfriNIC address blocks: 1187 Unique aggregates announced from the AfriNIC address blocks: 276 AfriNIC Region origin ASes present in the Internet Routing Table: 40 AfriNIC Prefixes per ASN: 29.68 AfriNIC Region origin ASes announcing only one prefix: 18 AfriNIC Region transit ASes present in the Internet Routing Table: 10 Average AfriNIC Region AS path length visible: 5.4 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: 2461696 Equivalent to 0 /8s, 37 /16s and 144 /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 598 2152 459 SINET-AS - Research Organization of Infor 7497 465 212 24 CSTNET-AS-AP - Computer Network Informati 1237 195 72 151 KREONET-AS-KR-KR - KISTI, KR 58647 182 18 2 KAGAWAU-AS - Kagawa University, JP 4538 163 2403 79 ERX-CERNET-BKB - China Education and Rese 7575 163 281 110 AARNET-AS-AP - Australian Academic and Re 55824 152 19 20 NKN-CORE-NW - NKN Core Network, IN 4762 75 4 1 MAHIDOL-BORDER-AS - Mahidol University, T 6262 63 134 56 CSIRO - Commonwealth Scientific and Indus 1659 57 458 32 ERX-TANET-ASN1 - Taiwan Academic Network Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 2152 709 508 100 CENIC-2152 - CENIC, US 2920 226 44 49 LACOE - Los Angeles County Office of Educ 5786 197 16 1 UPRENET - University of Puerto Rico, PR 376 196 146 150 RISQ-AS - Reseau d'Informations Scientifi 18558 141 18 5 NETBLK-RCOEK - Riverside County Office of 81 115 455 35 NCREN - MCNC, US 21976 92 34 14 NJEDGE-NET - NJEDge.Net, Inc., US 3477 85 79 42 NOAA-NWAVE - National Oceanic and Atmosph 237 83 542 49 MERIT-AS-14 - Merit Network Inc., US 1736 79 16 1 MU-AS - Marquette University, US Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 292 1884 254 DFN - Verein zur Foerderung eines Deutsch 786 210 1684 192 JANET - Jisc Services Limited, GB 559 115 533 105 Switch - SWITCH, CH 1103 98 1247 83 SURFNET-NL - SURF B.V., NL 8895 98 24 5 ISU - King Abdul Aziz City for Science an 2614 87 26 67 RoEduNet - Agentia de Administrare a Rete 137 82 677 77 ASGARR - Consortium GARR, IT 1930 78 88 73 RCCN - Fundacao para a Ciencia e a Tecnol 553 75 366 75 BELWUE - Universitaet Stuttgart, DE 2200 64 630 59 FR-RENATER - Renater, FR Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 219 161 40 AS1916 - Rede Nacional de Ensino e Pesqui 11340 110 25 49 AS11340 - Red Universitaria Nacional, CL 3596 66 8 4 AS3596 - Universidad Autonoma Metropolita 271640 65 8 1 AS271640 - UNIVERSIDADE FEDERAL DE VICOSA 19611 53 17 2 AS19611 - Associacao Antonio Vieira - Uni 61468 52 3 22 AS61468 - CEDIA, EC 2715 49 84 36 AS2715 - Fundacao Carlos Chagas Filho de 1251 37 31 26 AS1251 - FUNDACAO DE AMPARO A PESQUISA DO 21612 27 16 1 AS21612 - FUNDACAO INSTITUTO OSWALDO CRUZ 20191 26 16 1 AS20191 - Pontificia Universidad Catolica Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 531 82 3 Kenya Education Network - Kenya Education 2018 373 318 69 TENET (The UNINET Project) - TENET (The U 2561 68 4 34 Egyptian Universities Network (EUN) - Egy 8094 46 48 21 North West University - North West Univer 37215 45 8 1 Malawi Research and Education Network - M 6879 24 2 9 ENSTINET - ENSTINET, EG 327700 13 16 1 Mozambique Research & Education Network - 37501 11 49 6 University of the Free State - University 37182 10 8 1 Tanzania Education And Research Network - 37654 10 1 6 Rwanda Ministry of Education - Rwanda Min Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2152 709 508 100 CENIC-2152 - CENIC, US 2907 598 2152 459 SINET-AS - Research Organization of Infor 36914 531 82 3 Kenya Education Network - Kenya Education 7497 465 212 24 CSTNET-AS-AP - Computer Network Informati 2018 373 318 69 TENET (The UNINET Project) - TENET (The U 680 292 1884 254 DFN - Verein zur Foerderung eines Deutsch 2920 226 44 49 LACOE - Los Angeles County Office of Educ 1916 219 161 40 AS1916 - Rede Nacional de Ensino e Pesqui 786 210 1684 192 JANET - Jisc Services Limited, GB 5786 197 16 1 UPRENET - University of Puerto Rico, PR Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 531 528 Kenya Education Network - Kenya Education Netwo 7497 465 441 CSTNET-AS-AP - Computer Network Information Cen 2018 373 304 TENET (The UNINET Project) - TENET (The UNINET 5786 197 196 UPRENET - University of Puerto Rico, PR 58647 182 180 KAGAWAU-AS - Kagawa University, JP 1916 219 179 AS1916 - Rede Nacional de Ensino e Pesquisa, BR 2920 226 177 LACOE - Los Angeles County Office of Education, 2907 598 139 SINET-AS - Research Organization of Information 18558 141 136 NETBLK-RCOEK - Riverside County Office of Educa 55824 152 132 NKN-CORE-NW - NKN Core Network, IN Complete listing at https://bgp.nsrc.org/REN/ESnet/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276 - University 22272 UNALLOCATED 206.208.24.0/21 6325 ILLINOIS-CENTURY - Illi 401367 UNALLOCATED 216.186.25.0/24 10430 WA-K20 - Washington Sta Complete listing at https://bgp.nsrc.org/REN/ESnet/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 164.160.192.0/21 Origin: 37661 Nigerian Research and Education Network 164.160.192.0/21 Transit: 37288 West and Central African Research Networ 203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP - Adelaide Uni 203.9.156.0/24 Transit: 7575 AARNET-AS-AP - Australian Academic and R Complete listing at https://bgp.nsrc.org/REN/ESnet/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 /9:0 /10:0 /11:0 /12:0 /13:0 /14:33 /15:114 /16:1889 /17:417 /18:448 /19:592 /20:838 /21:856 /22:1412 /23:1587 /24:10601 /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 517 531 Kenya Education Network - Kenya Education Network, KE 8895 95 98 ISU - King Abdul Aziz City for Science and Technology, SA 2152 85 709 CENIC-2152 - CENIC, US 31638 48 48 ASN-LEPIDA - Lepida S.c.p.A., IT 37215 39 45 Malawi Research and Education Network - MAREN - Malawi Research and Education Network - MAREN, MW 200521 34 58 SEAP-AGE - Ministerio de Transformacion Digital y de la Funcion Publica, ES 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 40326 29 33 ECKERD-COLLEGE - Eckerd College, US Complete listing at https://bgp.nsrc.org/REN/ESnet/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:18 8:2 12:1 14:96 18:39 23:9 24:2 31:1 35:3 37:26 38:14 40:1 41:229 42:16 44:5 45:34 46:5 47:1 49:13 50:7 58:13 59:4 60:6 61:3 62:4 63:36 64:46 65:24 66:54 67:43 68:18 69:17 70:2 72:6 74:55 76:28 77:4 78:3 79:6 80:6 81:25 82:3 83:7 84:5 85:26 86:1 87:1 89:17 91:35 93:14 94:2 95:2 96:5 97:1 98:2 101:3 102:3 103:338 104:84 107:13 108:9 109:10 111:7 113:2 114:24 116:7 117:5 119:36 121:18 122:8 123:8 124:42 125:3 128:58 129:48 130:102 131:60 132:61 133:156 134:116 136:199 137:122 138:9 139:5 140:33 141:8 142:31 143:27 144:9 145:13 146:135 147:66 148:73 149:11 150:36 151:10 152:114 153:15 154:40 155:88 156:123 157:26 158:28 159:113 160:36 161:35 162:28 163:78 164:10 165:46 166:2 167:34 168:104 169:7 170:27 171:1 172:1 173:6 174:1 175:15 177:6 179:12 180:16 182:11 184:1 185:41 186:3 187:9 188:22 190:16 191:13 192:1411 193:294 194:99 195:83 196:148 197:337 198:573 199:243 200:304 201:5 202:601 203:423 204:418 205:179 206:199 207:357 208:40 209:162 210:230 211:5 212:135 213:4 216:94 217:22 218:19 219:6 220:16 222:4 223:6 End of report