IPv4 R&E Routing Table Report 22:20 GMT Sun 23 Mar, 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: 19124 Prefixes after maximum aggregation (per Origin AS): 10415 Deaggregation factor: 1.84 Unique aggregates announced (without unneeded subnets): 11572 Number of IPv4 prefixes with a valid ROA: 7445 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 11678 Total ASes present in the Internet Routing Table: 2745 Prefixes per ASN: 6.97 Origin-only ASes present in the Internet Routing Table: 2388 Origin ASes announcing only one prefix: 1070 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: 3.8 Max AS path length visible: 20 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 4 Number of instances of unregistered ASNs: 4 Number of 32-bit ASNs allocated by the RIRs: 46127 Number of 32-bit ASNs visible in the Routing Table: 691 Prefixes from 32-bit ASNs in the Routing Table: 1848 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: 168306432 Equivalent to 10 /8s, 8 /16s and 39 /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: 2292 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4712 Total APNIC prefixes after maximum aggregation: 2260 APNIC Deaggregation factor: 2.08 Prefixes being announced from the APNIC address blocks: 4713 Unique aggregates announced from the APNIC address blocks: 2610 APNIC Region origin ASes present in the Internet Routing Table: 572 APNIC Prefixes per ASN: 8.24 APNIC Region origin ASes announcing only one prefix: 235 APNIC Region transit ASes present in the Internet Routing Table: 52 Average APNIC Region AS path length visible: 3.6 Max APNIC Region AS path length visible: 12 Number of APNIC region 32-bit ASNs visible in the Routing Table: 226 Number of APNIC addresses announced to Internet: 35720704 Equivalent to 2 /8s, 33 /16s and 14 /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: 8498 Total ARIN prefixes after maximum aggregation: 4687 ARIN Deaggregation factor: 1.81 Prefixes being announced from the ARIN address blocks: 8510 Unique aggregates announced from the ARIN address blocks: 5176 ARIN Region origin ASes present in the Internet Routing Table: 1287 ARIN Prefixes per ASN: 6.61 ARIN Region origin ASes announcing only one prefix: 460 ARIN Region transit ASes present in the Internet Routing Table: 157 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: 230 Number of ARIN addresses announced to Internet: 73034240 Equivalent to 4 /8s, 90 /16s and 106 /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: 3524 Total RIPE prefixes after maximum aggregation: 2823 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3515 Unique aggregates announced from the RIPE address blocks: 2914 RIPE Region origin ASes present in the Internet Routing Table: 653 RIPE Prefixes per ASN: 5.38 RIPE Region origin ASes announcing only one prefix: 296 RIPE Region transit ASes present in the Internet Routing Table: 101 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: 149 Number of RIPE addresses announced to Internet: 53199616 Equivalent to 3 /8s, 43 /16s and 195 /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: 1256 Total LACNIC prefixes after maximum aggregation: 471 LACNIC Deaggregation factor: 2.67 Prefixes being announced from the LACNIC address blocks: 1255 Unique aggregates announced from the LACNIC address blocks: 649 LACNIC Region origin ASes present in the Internet Routing Table: 124 LACNIC Prefixes per ASN: 10.12 LACNIC Region origin ASes announcing only one prefix: 50 LACNIC Region transit ASes present in the Internet Routing Table: 21 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: 56 Number of LACNIC addresses announced to Internet: 3937792 Equivalent to 0 /8s, 60 /16s and 22 /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: 1130 Total AfriNIC prefixes after maximum aggregation: 171 AfriNIC Deaggregation factor: 6.61 Prefixes being announced from the AfriNIC address blocks: 1129 Unique aggregates announced from the AfriNIC address blocks: 221 AfriNIC Region origin ASes present in the Internet Routing Table: 50 AfriNIC Prefixes per ASN: 22.58 AfriNIC Region origin ASes announcing only one prefix: 29 AfriNIC Region transit ASes present in the Internet Routing Table: 9 Average AfriNIC Region AS path length visible: 4.2 Max AfriNIC Region AS path length visible: 20 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 30 Number of AfriNIC addresses announced to Internet: 2411776 Equivalent to 0 /8s, 36 /16s and 205 /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 623 2170 463 SINET-AS Research Organization of Informa 7497 452 180 24 CSTNET-AS-AP Computer Network Information 1237 193 74 145 KREONET-AS-KR KISTI, KR 58647 183 18 2 KAGAWAU-AS Kagawa University, JP 4538 176 2404 83 ERX-CERNET-BKB China Education and Resear 7575 168 297 112 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 534 507 99 CENIC-2152, US 2920 226 44 49 LACOE, US 376 201 162 151 RISQ-AS, CA 5786 199 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 85 542 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 680 284 1899 249 DFN Verein zur Foerderung eines Deutschen 786 196 1750 188 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Peering requests: peering@switch.c 8895 108 24 5 ISU Internet Services Unit ISU, SA 1103 95 1231 82 SURFNET-NL SURFnet, The Netherlands, NL 2614 90 26 70 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog 3267 77 26 67 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 236 178 41 Rede Nacional de Ensino e Pesquisa, BR 28391 157 10 69 Universidad Juarez Autonoma de Tabasco, M 11340 110 25 52 Red Universitaria Nacional, CL 271640 67 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 61468 52 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 536 82 3 KENET-AS, KE 2018 374 318 69 TENET-1, ZA 8094 47 48 18 PUKNET, ZA 37215 34 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 37661 12 8 4 NRaE1-AS, NG 37501 11 49 6 UOFS, ZA 327700 10 16 1 MoRENet, MZ 37654 9 1 6 RwEdNet-AS, RW 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 623 2170 463 SINET-AS Research Organization of Informa 36914 536 82 3 KENET-AS, KE 2152 534 507 99 CENIC-2152, US 7497 452 180 24 CSTNET-AS-AP Computer Network Information 2018 374 318 69 TENET-1, ZA 680 284 1899 249 DFN Verein zur Foerderung eines Deutschen 1916 236 178 41 Rede Nacional de Ensino e Pesquisa, BR 2920 226 44 49 LACOE, US 376 201 162 151 RISQ-AS, CA 5786 199 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 536 533 KENET-AS, KE 2152 534 435 CENIC-2152, US 7497 452 428 CSTNET-AS-AP Computer Network Information Cente 2018 374 305 TENET-1, ZA 5786 199 198 UPRENET, PR 1916 236 195 Rede Nacional de Ensino e Pesquisa, BR 58647 183 181 KAGAWAU-AS Kagawa University, JP 2920 226 177 LACOE, US 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 32344 UNALLOCATED 66.158.46.0/24 6325 ILLINOIS-CENTURY, US 32344 UNALLOCATED 66.158.47.0/24 6325 ILLINOIS-CENTURY, US 26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US 22272 UNALLOCATED 206.208.24.0/21 6325 ILLINOIS-CENTURY, 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 /16:1934 /17:418 /18:453 /19:577 /20:858 /21:840 /22:1456 /23:1595 /24:10846 /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 512 536 KENET-AS, KE 8895 105 108 ISU Internet Services Unit ISU, SA 2152 63 534 CENIC-2152, US 23024 38 99 OCDE, US 3267 35 77 NIKS, RU 32440 33 57 LONI, US 28614 32 38 Fundacao Universidade Regional de Blumenau, BR 46115 32 35 LUTHER, US 200521 31 55 SEAP-AGE, ES 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 5:15 8:5 12:2 14:93 18:42 23:12 24:3 31:1 35:9 37:8 38:12 40:1 41:213 42:18 44:4 45:39 46:4 47:1 49:8 50:4 52:1 58:15 59:20 60:6 61:3 62:6 63:37 64:45 65:19 66:52 67:43 68:18 69:16 70:2 71:1 72:8 74:54 76:36 77:10 78:3 79:9 80:13 81:24 82:6 83:8 84:5 85:50 86:2 87:1 89:10 91:41 92:2 93:14 94:2 95:2 96:5 97:1 98:2 101:3 102:11 103:341 104:77 107:2 108:8 109:5 111:21 113:1 114:24 116:7 117:61 118:33 119:30 121:27 122:8 123:8 124:42 125:5 128:57 129:41 130:99 131:64 132:66 133:157 134:106 136:200 137:98 138:58 139:12 140:31 141:3 142:27 143:25 144:29 145:2 146:137 147:53 148:199 149:11 150:69 151:13 152:127 153:15 154:46 155:80 156:131 157:25 158:11 159:117 160:32 161:15 162:31 163:58 164:10 165:48 166:2 167:29 168:103 169:7 170:27 171:2 172:2 173:5 174:1 175:16 177:7 179:10 180:16 181:1 182:12 184:2 185:49 186:3 187:23 188:14 189:3 190:17 191:13 192:1386 193:290 194:118 195:71 196:147 197:328 198:537 199:249 200:291 201:36 202:629 203:431 204:394 205:177 206:212 207:312 208:67 209:172 210:224 211:4 212:144 213:4 216:92 217:9 218:22 219:6 220:17 222:4 223:4 End of report