IPv4 R&E Routing Table Report 22:05 GMT Tue 26 May, 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: 20001 Prefixes after maximum aggregation (per Origin AS): 11591 Deaggregation factor: 1.73 Unique aggregates announced (without unneeded subnets): 12906 Number of IPv4 prefixes with a valid ROA: 9568 Number of IPv4 prefixes with an invalid ROA: 12 Number of IPv4 prefixes with no ROA: 10421 Total ASes present in the Internet Routing Table: 2739 Prefixes per ASN: 7.30 Origin-only ASes present in the Internet Routing Table: 2380 Origin ASes announcing only one prefix: 1055 Transit ASes present in the Internet Routing Table: 359 Transit-only ASes present in the Internet Routing Table: 51 Paths with bogon ASNs present in the IPv4 Routing Table: 5 Average AS path length visible in the Internet Routing Table: 3.9 Max AS path length visible: 15 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 6 Number of instances of unregistered ASNs: 6 Number of 32-bit ASNs allocated by the RIRs: 49887 Number of 32-bit ASNs visible in the Routing Table: 707 Prefixes from 32-bit ASNs in the Routing Table: 1978 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: 3 Number of addresses announced to Internet: 269096192 Equivalent to 16 /8s, 10 /16s and 21 /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: 2334 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4826 Total APNIC prefixes after maximum aggregation: 2366 APNIC Deaggregation factor: 2.04 Prefixes being announced from the APNIC address blocks: 4919 Unique aggregates announced from the APNIC address blocks: 2716 APNIC Region origin ASes present in the Internet Routing Table: 607 APNIC Prefixes per ASN: 8.10 APNIC Region origin ASes announcing only one prefix: 259 APNIC Region transit ASes present in the Internet Routing Table: 53 Average APNIC Region AS path length visible: 4.1 Max APNIC Region AS path length visible: 12 Number of APNIC region 32-bit ASNs visible in the Routing Table: 251 Number of APNIC addresses announced to Internet: 47266048 Equivalent to 2 /8s, 209 /16s and 57 /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: 9521 Total ARIN prefixes after maximum aggregation: 5934 ARIN Deaggregation factor: 1.60 Prefixes being announced from the ARIN address blocks: 9068 Unique aggregates announced from the ARIN address blocks: 6286 ARIN Region origin ASes present in the Internet Routing Table: 1315 ARIN Prefixes per ASN: 6.90 ARIN Region origin ASes announcing only one prefix: 457 ARIN Region transit ASes present in the Internet Routing Table: 162 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: 228 Number of ARIN addresses announced to Internet: 135151616 Equivalent to 8 /8s, 14 /16s and 64 /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: 3361 Total RIPE prefixes after maximum aggregation: 2678 RIPE Deaggregation factor: 1.26 Prefixes being announced from the RIPE address blocks: 3717 Unique aggregates announced from the RIPE address blocks: 3119 RIPE Region origin ASes present in the Internet Routing Table: 593 RIPE Prefixes per ASN: 6.27 RIPE Region origin ASes announcing only one prefix: 267 RIPE Region transit ASes present in the Internet Routing Table: 99 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: 79723008 Equivalent to 4 /8s, 192 /16s and 122 /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: 1071 Total LACNIC prefixes after maximum aggregation: 403 LACNIC Deaggregation factor: 2.66 Prefixes being announced from the LACNIC address blocks: 1074 Unique aggregates announced from the LACNIC address blocks: 494 LACNIC Region origin ASes present in the Internet Routing Table: 124 LACNIC Prefixes per ASN: 8.66 LACNIC Region origin ASes announcing only one prefix: 51 LACNIC Region transit ASes present in the Internet Routing Table: 21 Average LACNIC Region AS path length visible: 4.6 Max LACNIC Region AS path length visible: 9 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 56 Number of LACNIC addresses announced to Internet: 4344832 Equivalent to 0 /8s, 66 /16s and 76 /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: 1216 Total AfriNIC prefixes after maximum aggregation: 204 AfriNIC Deaggregation factor: 5.96 Prefixes being announced from the AfriNIC address blocks: 1220 Unique aggregates announced from the AfriNIC address blocks: 288 AfriNIC Region origin ASes present in the Internet Routing Table: 45 AfriNIC Prefixes per ASN: 27.11 AfriNIC Region origin ASes announcing only one prefix: 21 AfriNIC Region transit ASes present in the Internet Routing Table: 11 Average AfriNIC Region AS path length visible: 3.2 Max AfriNIC Region AS path length visible: 8 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 20 Number of AfriNIC addresses announced to Internet: 2608128 Equivalent to 0 /8s, 39 /16s and 204 /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 606 2153 464 SINET-AS - Research Organization of Infor 7497 465 212 24 CSTNET-AS-AP - Computer Network Informati 1237 199 72 154 KREONET-AS-KR-KR - KISTI, KR 58647 182 18 2 KAGAWAU-AS - Kagawa University, JP 4538 181 4191 71 ERX-CERNET-BKB - China Education and Rese 7575 166 281 113 AARNET-AS-AP - Australian Academic and Re 55824 151 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 61 1466 35 ERX-TANET-ASN1 - Taiwan Academic Network 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 960 16037 785 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft C 5786 197 16 1 UPRENET - University of Puerto Rico, PR 376 196 146 150 RISQ-AS - Reseau d'Informations Scientifi 668 190 609 163 DNIC-AS-00668 - United States Department 2920 173 34 7 LACOE - Los Angeles County Office of Educ 2152 144 491 95 CENIC-2152 - CENIC, US 270 142 517 94 AS270 - National Aeronautics and Space Ad 18558 140 18 4 NETBLK-RCOEK - Riverside County Office of 81 115 455 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 680 291 1883 253 DFN - Verein zur Foerderung eines Deutsch 786 210 1684 192 JANET - Jisc Services Limited, GB 559 115 533 105 Switch - SWITCH, CH 1103 100 1759 85 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/CENIC/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 220 161 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 2715 57 84 39 AS2715 - Fundacao Carlos Chagas Filho de 19611 53 17 2 AS19611 - Associacao Antonio Vieira - Uni 61468 51 3 20 AS61468 - CEDIA, EC 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/CENIC/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 551 82 3 Kenya Education Network - Kenya Education 2018 374 318 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/CENIC/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 8075 960 16037 785 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft C 2907 606 2153 464 SINET-AS - Research Organization of Infor 36914 551 82 3 Kenya Education Network - Kenya Education 7497 465 212 24 CSTNET-AS-AP - Computer Network Informati 2018 374 318 69 TENET (The UNINET Project) - TENET (The U 680 291 1883 253 DFN - Verein zur Foerderung eines Deutsch 1916 220 161 40 AS1916 - Rede Nacional de Ensino e Pesqui 786 210 1684 192 JANET - Jisc Services Limited, GB 1237 199 72 154 KREONET-AS-KR-KR - KISTI, KR 5786 197 16 1 UPRENET - University of Puerto Rico, PR 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 551 548 Kenya Education Network - Kenya Education Netwo 7497 465 441 CSTNET-AS-AP - Computer Network Information Cen 2018 374 305 TENET (The UNINET Project) - TENET (The UNINET 5786 197 196 UPRENET - University of Puerto Rico, PR 1916 220 180 AS1916 - Rede Nacional de Ensino e Pesquisa, BR 58647 182 180 KAGAWAU-AS - Kagawa University, JP 2920 173 166 LACOE - Los Angeles County Office of Education, 2907 606 142 SINET-AS - Research Organization of Information 18558 140 136 NETBLK-RCOEK - Riverside County Office of Educa 55824 151 131 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 65208 PRIVATE 206.206.156.0/22 11570 AS11570 - Eastern New M 65208 PRIVATE 216.161.32.0/23 11570 AS11570 - Eastern New M 401367 UNALLOCATED 216.186.25.0/24 10430 WA-K20 - Washington Sta Complete listing at https://bgp.nsrc.org/REN/CENIC/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 202.14.117.0/24 Origin: 17827 STOU-AS-TH - Sukhothai Thammathirat Open 202.14.117.0/24 Transit: 4621 UNINET-AS-AP - UNINET-TH, TH 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/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 /14:62 /15:153 /16:2173 /17:448 /18:480 /19:613 /20:844 /21:904 /22:1467 /23:1611 /24:11179 /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 527 551 Kenya Education Network - Kenya Education Network, KE 8075 197 960 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US 8895 95 98 ISU - King Abdul Aziz City for Science and Technology, SA 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/CENIC/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 2:1 4:2 5:20 6:5 8:13 12:2 13:32 14:95 20:21 23:11 24:2 31:2 35:10 37:28 38:11 40:2 41:237 42:16 44:6 45:43 46:5 47:1 49:13 50:7 52:5 58:13 59:20 60:6 61:3 62:14 63:38 64:57 65:9 66:75 67:46 68:18 69:34 70:4 72:6 74:61 76:27 77:4 78:3 79:7 80:8 81:28 82:3 83:8 84:5 85:26 86:4 87:1 89:18 91:43 93:14 94:9 95:2 96:5 97:2 98:3 101:5 102:8 103:364 104:91 107:13 108:12 109:13 111:8 113:6 114:24 115:1 116:9 117:6 118:33 119:36 121:18 122:8 123:8 124:42 125:3 128:61 129:48 130:105 131:78 132:62 133:157 134:123 135:6 136:199 137:68 138:18 139:5 140:35 141:12 142:41 143:27 144:14 145:23 146:137 147:71 148:74 149:11 150:41 151:10 152:129 153:19 154:40 155:100 156:134 157:29 158:31 159:116 160:36 161:51 162:33 163:83 164:16 165:59 166:3 167:37 168:104 169:7 170:41 171:1 172:1 173:7 175:15 176:1 177:6 178:2 179:12 180:16 181:1 182:11 184:6 185:77 186:4 187:9 188:23 190:17 191:13 192:1578 193:306 194:125 195:100 196:150 197:338 198:499 199:317 200:312 201:5 202:617 203:455 204:404 205:129 206:215 207:220 208:64 209:103 210:232 211:15 212:141 213:9 214:8 216:107 217:25 218:21 219:7 220:16 222:4 223:17 End of report