IPv4 R&E Routing Table Report 22:20 GMT Wed 18 Jun, 2025 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: 18957 Prefixes after maximum aggregation (per Origin AS): 10400 Deaggregation factor: 1.82 Unique aggregates announced (without unneeded subnets): 11555 Number of IPv4 prefixes with a valid ROA: 7727 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 11229 Total ASes present in the Internet Routing Table: 2755 Prefixes per ASN: 6.88 Origin-only ASes present in the Internet Routing Table: 2398 Origin ASes announcing only one prefix: 1066 Transit ASes present in the Internet Routing Table: 357 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: 3.9 Max AS path length visible: 18 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 34 Number of instances of unregistered ASNs: 34 Number of 32-bit ASNs allocated by the RIRs: 46679 Number of 32-bit ASNs visible in the Routing Table: 700 Prefixes from 32-bit ASNs in the Routing Table: 1903 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: 168302080 Equivalent to 10 /8s, 8 /16s and 22 /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: 2267 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4710 Total APNIC prefixes after maximum aggregation: 2282 APNIC Deaggregation factor: 2.06 Prefixes being announced from the APNIC address blocks: 4711 Unique aggregates announced from the APNIC address blocks: 2636 APNIC Region origin ASes present in the Internet Routing Table: 586 APNIC Prefixes per ASN: 8.04 APNIC Region origin ASes announcing only one prefix: 245 APNIC Region transit ASes present in the Internet Routing Table: 52 Average APNIC Region AS path length visible: 3.8 Max APNIC Region AS path length visible: 12 Number of APNIC region 32-bit ASNs visible in the Routing Table: 234 Number of APNIC addresses announced to Internet: 35774720 Equivalent to 2 /8s, 33 /16s and 225 /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: 8367 Total ARIN prefixes after maximum aggregation: 4657 ARIN Deaggregation factor: 1.80 Prefixes being announced from the ARIN address blocks: 8409 Unique aggregates announced from the ARIN address blocks: 5148 ARIN Region origin ASes present in the Internet Routing Table: 1281 ARIN Prefixes per ASN: 6.56 ARIN Region origin ASes announcing only one prefix: 454 ARIN Region transit ASes present in the Internet Routing Table: 156 Average ARIN Region AS path length visible: 3.8 Max ARIN Region AS path length visible: 15 Number of ARIN region 32-bit ASNs visible in the Routing Table: 229 Number of ARIN addresses announced to Internet: 72895488 Equivalent to 4 /8s, 88 /16s and 76 /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: 3516 Total RIPE prefixes after maximum aggregation: 2809 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3507 Unique aggregates announced from the RIPE address blocks: 2894 RIPE Region origin ASes present in the Internet Routing Table: 654 RIPE Prefixes per ASN: 5.36 RIPE Region origin ASes announcing only one prefix: 292 RIPE Region transit ASes present in the Internet Routing Table: 103 Average RIPE Region AS path length visible: 3.7 Max RIPE Region AS path length visible: 13 Number of RIPE region 32-bit ASNs visible in the Routing Table: 152 Number of RIPE addresses announced to Internet: 53169920 Equivalent to 3 /8s, 43 /16s and 79 /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: 1259 Total LACNIC prefixes after maximum aggregation: 471 LACNIC Deaggregation factor: 2.67 Prefixes being announced from the LACNIC address blocks: 1258 Unique aggregates announced from the LACNIC address blocks: 648 LACNIC Region origin ASes present in the Internet Routing Table: 122 LACNIC Prefixes per ASN: 10.31 LACNIC Region origin ASes announcing only one prefix: 48 LACNIC Region transit ASes present in the Internet Routing Table: 20 Average LACNIC Region AS path length visible: 4.3 Max LACNIC Region AS path length visible: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 55 Number of LACNIC addresses announced to Internet: 3928576 Equivalent to 0 /8s, 59 /16s and 242 /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: 1071 Total AfriNIC prefixes after maximum aggregation: 175 AfriNIC Deaggregation factor: 6.12 Prefixes being announced from the AfriNIC address blocks: 1070 Unique aggregates announced from the AfriNIC address blocks: 227 AfriNIC Region origin ASes present in the Internet Routing Table: 53 AfriNIC Prefixes per ASN: 20.19 AfriNIC Region origin ASes announcing only one prefix: 27 AfriNIC Region transit ASes present in the Internet Routing Table: 10 Average AfriNIC Region AS path length visible: 5.3 Max AfriNIC Region AS path length visible: 18 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 30 Number of AfriNIC addresses announced to Internet: 2531072 Equivalent to 0 /8s, 38 /16s and 159 /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 597 2170 463 SINET-AS Research Organization of Informa 7497 456 180 24 CSTNET-AS-AP Computer Network Information 1237 193 74 145 KREONET-AS-KR KISTI, KR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 173 2402 81 ERX-CERNET-BKB China Education and Resear 7575 167 281 112 AARNET-AS-AP Australian Academic and Rese 55824 147 19 21 NKN-CORE-NW NKN Core Network, IN 4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha 4621 59 35 8 UNINET-AS-AP UNINET-, TH 23570 59 5 11 INCHEON-AS-KR UNIVERSITY OF INCHEON, KR 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 549 507 99 CENIC-2152, US 2920 229 44 49 LACOE, US 376 200 162 150 RISQ-AS, CA 5786 200 16 1 UPRENET, PR 18558 140 18 5 NETBLK-RCOEK, US 81 128 471 35 NCREN, US 23024 99 7 17 OCDE, US 21976 88 34 14 NJEDGE-NET, US 237 85 543 51 MERIT-AS-14, US 1736 79 16 1 MU-AS, 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 680 283 1899 249 DFN Verein zur Foerderung eines Deutschen 786 193 1742 186 JANET Jisc Services Limited, GB 559 113 533 108 SWITCH Peering requests: peering@switch.c 8895 109 24 5 ISU Internet Services Unit ISU, SA 1103 96 1231 82 SURFNET-NL SURFnet, The Netherlands, NL 2614 92 26 69 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog 3267 79 29 69 NIKS, RU 553 75 366 75 BELWUE BelWue-Koordination, DE 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 241 177 40 Rede Nacional de Ensino e Pesquisa, BR 28391 159 10 71 Universidad Juarez Autonoma de Tabasco, M 11340 110 25 52 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 61468 51 3 21 CEDIA, EC 19611 48 17 2 Associacao Antonio Vieira - Unisinos, BR 2715 44 99 33 Fundacao Carlos Chagas Filho de Amparo a 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/ESnet/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 467 82 3 KENET-AS, KE 2018 374 318 69 TENET-1, ZA 8094 47 48 18 PUKNET, ZA 37215 36 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 37501 11 49 6 UOFS, ZA 327700 11 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 37661 9 6 3 NRaE1-AS, NG 36982 8 33 8 UCT, ZA 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 2907 597 2170 463 SINET-AS Research Organization of Informa 2152 549 507 99 CENIC-2152, US 36914 467 82 3 KENET-AS, KE 7497 456 180 24 CSTNET-AS-AP Computer Network Information 2018 374 318 69 TENET-1, ZA 680 283 1899 249 DFN Verein zur Foerderung eines Deutschen 1916 241 177 40 Rede Nacional de Ensino e Pesquisa, BR 2920 229 44 49 LACOE, US 376 200 162 150 RISQ-AS, CA 5786 200 16 1 UPRENET, 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 467 464 KENET-AS, KE 2152 549 450 CENIC-2152, US 7497 456 432 CSTNET-AS-AP Computer Network Information Cente 2018 374 305 TENET-1, ZA 1916 241 201 Rede Nacional de Ensino e Pesquisa, BR 5786 200 199 UPRENET, PR 2920 229 180 LACOE, US 58647 182 180 KAGAWAU-AS Kagawa University, JP 18558 140 135 NETBLK-RCOEK, US 55824 147 126 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, 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 22272 UNALLOCATED 206.208.24.0/21 6325 ILLINOIS-CENTURY, 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 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 NRaE1-AS, NG 164.160.192.0/21 Transit: 37288 WACREN, SN 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/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 /16:1929 /17:424 /18:458 /19:586 /20:861 /21:834 /22:1435 /23:1582 /24:10701 /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 454 467 KENET-AS, KE 8895 106 109 ISU Internet Services Unit ISU, SA 2152 65 549 CENIC-2152, US 23024 38 99 OCDE, US 3267 35 79 NIKS, RU 28614 32 38 Fundacao Universidade Regional de Blumenau, BR 46115 32 35 LUTHER, US 200521 32 56 SEAP-AGE, ES 32440 31 54 LONI, US 25977 30 44 HCCS, US Complete listing at https://bgp.nsrc.org/REN/ESnet/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:16 8:5 12:2 14:92 18:39 23:11 24:3 31:1 35:9 37:14 38:13 40:1 41:156 42:18 44:4 45:44 46:5 47:1 49:12 50:5 52:1 58:15 59:20 60:6 61:3 62:6 63:36 64:47 65:20 66:52 67:43 68:19 69:18 70:2 71:1 72:8 74:53 76:36 77:9 78:3 79:9 80:13 81:25 82:6 83:8 84:4 85:51 86:3 87:1 89:10 91:40 92:2 93:14 94:2 95:2 96:5 97:1 98:2 101:3 102:11 103:354 104:77 107:2 108:8 109:5 111:21 113:1 114:24 116:7 117:61 118:34 119:31 121:28 122:8 123:8 124:42 125:5 128:55 129:40 130:97 131:68 132:68 133:156 134:105 136:200 137:105 138:10 139:6 140:32 141:3 142:27 143:27 144:23 145:2 146:137 147:52 148:201 149:10 150:37 151:13 152:126 153:13 154:46 155:80 156:129 157:24 158:29 159:117 160:32 161:15 162:30 163:66 164:9 165:43 166:2 167:26 168:103 169:7 170:26 171:1 172:2 173:6 174:1 175:16 177:5 179:12 180:16 181:1 182:12 184:2 185:52 186:3 187:24 188:15 189:3 190:17 191:13 192:1379 193:284 194:121 195:71 196:148 197:334 198:515 199:252 200:299 201:37 202:597 203:436 204:394 205:175 206:201 207:309 208:66 209:174 210:208 211:4 212:148 213:4 216:92 217:22 218:22 219:6 220:16 222:4 223:6 End of report