IPv4 R&E Routing Table Report 17:00 GMT Sun 17 Aug, 2025 IPv4 BGP Table (R&E) as seen at GEANT. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/GEANT/ Analysis Summary ---------------- BGP routing table entries examined: 18540 Prefixes after maximum aggregation (per Origin AS): 10307 Deaggregation factor: 1.80 Unique aggregates announced (without unneeded subnets): 11394 Number of IPv4 prefixes with a valid ROA: 7843 Number of IPv4 prefixes with an invalid ROA: 2 Number of IPv4 prefixes with no ROA: 10695 Total ASes present in the Internet Routing Table: 2685 Prefixes per ASN: 6.91 Origin-only ASes present in the Internet Routing Table: 2335 Origin ASes announcing only one prefix: 1043 Transit ASes present in the Internet Routing Table: 350 Transit-only ASes present in the Internet Routing Table: 56 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 3.8 Max AS path length visible: 17 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 33 Number of instances of unregistered ASNs: 33 Number of 32-bit ASNs allocated by the RIRs: 47200 Number of 32-bit ASNs visible in the Routing Table: 686 Prefixes from 32-bit ASNs in the Routing Table: 1844 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: 198814176 Equivalent to 11 /8s, 217 /16s and 169 /24s Percentage of available address space announced: 5.4 Percentage of allocated address space announced: 5.4 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: 2228 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4795 Total APNIC prefixes after maximum aggregation: 2312 APNIC Deaggregation factor: 2.07 Prefixes being announced from the APNIC address blocks: 4792 Unique aggregates announced from the APNIC address blocks: 2628 APNIC Region origin ASes present in the Internet Routing Table: 585 APNIC Prefixes per ASN: 8.19 APNIC Region origin ASes announcing only one prefix: 245 APNIC Region transit ASes present in the Internet Routing Table: 51 Average APNIC Region AS path length visible: 3.6 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 238 Number of APNIC addresses announced to Internet: 45409088 Equivalent to 2 /8s, 180 /16s and 227 /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: 7823 Total ARIN prefixes after maximum aggregation: 4649 ARIN Deaggregation factor: 1.68 Prefixes being announced from the ARIN address blocks: 7872 Unique aggregates announced from the ARIN address blocks: 5183 ARIN Region origin ASes present in the Internet Routing Table: 1255 ARIN Prefixes per ASN: 6.27 ARIN Region origin ASes announcing only one prefix: 438 ARIN Region transit ASes present in the Internet Routing Table: 153 Average ARIN Region AS path length visible: 4.2 Max ARIN Region AS path length visible: 15 Number of ARIN region 32-bit ASNs visible in the Routing Table: 211 Number of ARIN addresses announced to Internet: 90248096 Equivalent to 5 /8s, 97 /16s and 19 /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: 3362 Total RIPE prefixes after maximum aggregation: 2688 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3348 Unique aggregates announced from the RIPE address blocks: 2703 RIPE Region origin ASes present in the Internet Routing Table: 606 RIPE Prefixes per ASN: 5.52 RIPE Region origin ASes announcing only one prefix: 278 RIPE Region transit ASes present in the Internet Routing Table: 102 Average RIPE Region AS path length visible: 2.8 Max RIPE Region AS path length visible: 12 Number of RIPE region 32-bit ASNs visible in the Routing Table: 146 Number of RIPE addresses announced to Internet: 56742080 Equivalent to 3 /8s, 97 /16s and 208 /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: 1354 Total LACNIC prefixes after maximum aggregation: 483 LACNIC Deaggregation factor: 2.80 Prefixes being announced from the LACNIC address blocks: 1353 Unique aggregates announced from the LACNIC address blocks: 649 LACNIC Region origin ASes present in the Internet Routing Table: 131 LACNIC Prefixes per ASN: 10.33 LACNIC Region origin ASes announcing only one prefix: 53 LACNIC Region transit ASes present in the Internet Routing Table: 24 Average LACNIC Region AS path length visible: 5.0 Max LACNIC Region AS path length visible: 17 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 60 Number of LACNIC addresses announced to Internet: 4001344 Equivalent to 0 /8s, 61 /16s and 14 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-274844 + 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: 1173 Total AfriNIC prefixes after maximum aggregation: 170 AfriNIC Deaggregation factor: 6.90 Prefixes being announced from the AfriNIC address blocks: 1172 Unique aggregates announced from the AfriNIC address blocks: 228 AfriNIC Region origin ASes present in the Internet Routing Table: 50 AfriNIC Prefixes per ASN: 23.44 AfriNIC Region origin ASes announcing only one prefix: 29 AfriNIC Region transit ASes present in the Internet Routing Table: 8 Average AfriNIC Region AS path length visible: 3.8 Max AfriNIC Region AS path length visible: 14 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 31 Number of AfriNIC addresses announced to Internet: 2411008 Equivalent to 0 /8s, 36 /16s and 202 /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 605 2169 463 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 1237 194 74 146 KREONET-AS-KR KISTI, KR 4538 189 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 169 281 114 AARNET-AS-AP Australian Academic and Rese 55824 149 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/GEANT/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 668 202 648 170 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 2920 178 34 7 LACOE, US 5786 171 16 1 UPRENET, PR 2152 148 491 97 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 81 127 471 35 NCREN, US 21976 88 34 14 NJEDGE-NET, US 237 84 542 50 MERIT-AS-14, US 1736 79 16 1 MU-AS, US Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 286 1883 252 DFN Verein zur Foerderung eines Deutschen 786 190 1742 185 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Switch, Swiss Academic and Researc 8895 109 24 5 ISU Internet Services Unit ISU, SA 1103 98 1503 84 SURFNET-NL SURFnet, The Netherlands, NL 2614 92 26 69 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 63 614 58 FR-RENATER Reseau National de telecommuni Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 328 177 43 Rede Nacional de Ensino e Pesquisa, BR 28391 159 10 71 Universidad Juarez Autonoma de Tabasco, M 11340 111 25 50 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 61468 52 3 21 CEDIA, EC 19611 49 17 2 Associacao Antonio Vieira - Unisinos, BR 2715 45 99 33 Fundacao Carlos Chagas Filho de Amparo a 3596 40 8 4 Universidad Autonoma Metropolitana, MX 28614 38 2 2 Fundacao Universidade Regional de Blumena 1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 572 82 3 KENET-AS, KE 2018 375 318 69 TENET-1, ZA 8094 47 48 18 PUKNET, ZA 37215 38 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 37501 11 49 6 UOFS, ZA 327700 11 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 36982 8 33 8 UCT, ZA Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 605 2169 463 SINET-AS Research Organization of Informa 36914 572 82 3 KENET-AS, KE 7497 452 180 23 CSTNET-AS-AP Computer Network Information 2018 375 318 69 TENET-1, ZA 1916 328 177 43 Rede Nacional de Ensino e Pesquisa, BR 680 286 1883 252 DFN Verein zur Foerderung eines Deutschen 668 202 648 170 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 1237 194 74 146 KREONET-AS-KR KISTI, KR 786 190 1742 185 JANET Jisc Services Limited, GB Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 572 569 KENET-AS, KE 7497 452 429 CSTNET-AS-AP Computer Network Information Cente 2018 375 306 TENET-1, ZA 1916 328 285 Rede Nacional de Ensino e Pesquisa, BR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 178 171 LACOE, US 5786 171 170 UPRENET, PR 18558 139 135 NETBLK-RCOEK, US 55824 149 128 NKN-CORE-NW NKN Core Network, IN 4538 189 118 ERX-CERNET-BKB China Education and Research Net Complete listing at https://bgp.nsrc.org/REN/GEANT/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, US 26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US Complete listing at https://bgp.nsrc.org/REN/GEANT/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 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 The University 203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res Complete listing at https://bgp.nsrc.org/REN/GEANT/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 /11:1 /12:10 /13:18 /14:35 /15:115 /16:1976 /17:417 /18:457 /19:583 /20:820 /21:839 /22:1341 /23:1481 /24:10253 /25:61 /26:83 /27:48 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 548 572 KENET-AS, KE 8895 106 109 ISU Internet Services Unit ISU, SA 1916 88 328 Rede Nacional de Ensino e Pesquisa, BR 200521 33 58 SEAP-AGE, ES 28614 32 38 Fundacao Universidade Regional de Blumenau, BR 37215 32 38 MAREN, MW 46115 32 35 LUTHER, US 25977 30 44 HCCS, US 27609 29 45 USC-UNIVERSITY-HOSPITAL, US 40326 29 33 ECKERD-COLLEGE, US Complete listing at https://bgp.nsrc.org/REN/GEANT/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:16 6:4 8:2 12:1 14:93 23:9 24:2 31:1 35:4 37:14 38:10 40:1 41:228 42:17 44:6 45:37 46:5 47:1 49:12 50:2 52:1 58:15 59:20 60:6 61:3 62:6 63:32 64:43 65:5 66:33 67:40 68:12 69:17 70:2 71:1 72:8 74:51 76:25 77:6 78:3 79:9 80:10 81:27 82:3 83:7 84:8 85:28 87:1 89:9 91:40 93:15 94:2 95:2 96:5 97:1 98:2 101:3 102:11 103:338 104:76 108:8 109:7 110:1 111:17 113:1 114:21 116:7 117:61 118:33 119:31 121:28 122:8 123:8 124:42 125:3 128:59 129:44 130:96 131:65 132:68 133:156 134:115 136:172 137:53 138:11 139:5 140:32 141:3 142:26 143:27 144:33 145:4 146:138 147:28 148:200 149:10 150:36 151:10 152:124 153:15 154:40 155:85 156:133 157:23 158:25 159:117 160:34 161:15 162:22 163:72 164:10 165:43 167:12 168:96 169:6 170:18 172:1 173:5 175:16 177:5 179:13 180:16 181:1 182:12 184:6 185:45 186:3 187:24 188:14 190:17 191:13 192:1438 193:261 194:110 195:78 196:148 197:353 198:443 199:273 200:304 201:21 202:627 203:434 204:372 205:133 206:202 207:219 208:61 209:84 210:221 211:4 212:146 213:4 214:10 216:89 217:22 218:23 219:7 220:16 222:4 223:5 End of report