IPv4 R&E Routing Table Report 22:20 GMT Mon 05 May, 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: 18899 Prefixes after maximum aggregation (per Origin AS): 10315 Deaggregation factor: 1.83 Unique aggregates announced (without unneeded subnets): 11374 Number of IPv4 prefixes with a valid ROA: 7576 Number of IPv4 prefixes with an invalid ROA: 2 Number of IPv4 prefixes with no ROA: 11321 Total ASes present in the Internet Routing Table: 2752 Prefixes per ASN: 6.87 Origin-only ASes present in the Internet Routing Table: 2395 Origin ASes announcing only one prefix: 1062 Transit ASes present in the Internet Routing Table: 357 Transit-only ASes present in the Internet Routing Table: 57 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: 35 Number of instances of unregistered ASNs: 35 Number of 32-bit ASNs allocated by the RIRs: 46335 Number of 32-bit ASNs visible in the Routing Table: 697 Prefixes from 32-bit ASNs in the Routing Table: 1906 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: 168352768 Equivalent to 10 /8s, 8 /16s and 220 /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: 2295 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4759 Total APNIC prefixes after maximum aggregation: 2273 APNIC Deaggregation factor: 2.09 Prefixes being announced from the APNIC address blocks: 4760 Unique aggregates announced from the APNIC address blocks: 2639 APNIC Region origin ASes present in the Internet Routing Table: 581 APNIC Prefixes per ASN: 8.19 APNIC Region origin ASes announcing only one prefix: 240 APNIC Region transit ASes present in the Internet Routing Table: 51 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: 233 Number of APNIC addresses announced to Internet: 35766528 Equivalent to 2 /8s, 33 /16s and 193 /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: 8343 Total ARIN prefixes after maximum aggregation: 4640 ARIN Deaggregation factor: 1.80 Prefixes being announced from the ARIN address blocks: 8386 Unique aggregates announced from the ARIN address blocks: 5112 ARIN Region origin ASes present in the Internet Routing Table: 1287 ARIN Prefixes per ASN: 6.52 ARIN Region origin ASes announcing only one prefix: 458 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: 231 Number of ARIN addresses announced to Internet: 73010176 Equivalent to 4 /8s, 90 /16s and 12 /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: 3529 Total RIPE prefixes after maximum aggregation: 2823 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3520 Unique aggregates announced from the RIPE address blocks: 2904 RIPE Region origin ASes present in the Internet Routing Table: 652 RIPE Prefixes per ASN: 5.40 RIPE Region origin ASes announcing only one prefix: 289 RIPE Region transit ASes present in the Internet Routing Table: 102 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: 148 Number of RIPE addresses announced to Internet: 53227520 Equivalent to 3 /8s, 44 /16s and 48 /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: 1101 Total LACNIC prefixes after maximum aggregation: 401 LACNIC Deaggregation factor: 2.75 Prefixes being announced from the LACNIC address blocks: 1100 Unique aggregates announced from the LACNIC address blocks: 494 LACNIC Region origin ASes present in the Internet Routing Table: 121 LACNIC Prefixes per ASN: 9.09 LACNIC Region origin ASes announcing only one prefix: 49 LACNIC Region transit ASes present in the Internet Routing Table: 20 Average LACNIC Region AS path length visible: 4.0 Max LACNIC Region AS path length visible: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 57 Number of LACNIC addresses announced to Internet: 3828736 Equivalent to 0 /8s, 58 /16s and 108 /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: 1132 Total AfriNIC prefixes after maximum aggregation: 171 AfriNIC Deaggregation factor: 6.62 Prefixes being announced from the AfriNIC address blocks: 1131 Unique aggregates announced from the AfriNIC address blocks: 223 AfriNIC Region origin ASes present in the Internet Routing Table: 50 AfriNIC Prefixes per ASN: 22.62 AfriNIC Region origin ASes announcing only one prefix: 26 AfriNIC Region transit ASes present in the Internet Routing Table: 9 Average AfriNIC Region AS path length visible: 4.5 Max AfriNIC Region AS path length visible: 20 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 28 Number of AfriNIC addresses announced to Internet: 2517504 Equivalent to 0 /8s, 38 /16s and 106 /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 454 180 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 168 281 112 AARNET-AS-AP Australian Academic and Rese 55824 146 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 543 507 99 CENIC-2152, US 2920 222 44 49 LACOE, US 376 202 162 151 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 680 283 1899 249 DFN Verein zur Foerderung eines Deutschen 786 194 1750 186 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Peering requests: peering@switch.c 8895 109 24 5 ISU Internet Services Unit ISU, SA 1103 95 1231 82 SURFNET-NL SURFnet, The Netherlands, NL 2614 89 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 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 241 178 41 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 52 Red Universitaria Nacional, CL 271640 68 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 20191 28 16 1 Pontificia Universidad Catolica de Chile, 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 535 82 3 KENET-AS, KE 2018 373 318 69 TENET-1, ZA 8094 47 48 18 PUKNET, ZA 37215 34 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 623 2170 463 SINET-AS Research Organization of Informa 2152 543 507 99 CENIC-2152, US 36914 535 82 3 KENET-AS, KE 7497 454 180 24 CSTNET-AS-AP Computer Network Information 2018 373 318 69 TENET-1, ZA 680 283 1899 249 DFN Verein zur Foerderung eines Deutschen 1916 241 178 41 Rede Nacional de Ensino e Pesquisa, BR 2920 222 44 49 LACOE, US 376 202 162 151 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 535 532 KENET-AS, KE 2152 543 444 CENIC-2152, US 7497 454 430 CSTNET-AS-AP Computer Network Information Cente 2018 373 304 TENET-1, ZA 1916 241 200 Rede Nacional de Ensino e Pesquisa, BR 5786 199 198 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 222 173 LACOE, US 18558 140 135 NETBLK-RCOEK, US 55824 146 125 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 36288 UNALLOCATED 64.79.154.0/24 293 ESNET, US 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 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 /16:1931 /17:423 /18:459 /19:588 /20:851 /21:836 /22:1441 /23:1589 /24:10634 /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 511 535 KENET-AS, KE 8895 106 109 ISU Internet Services Unit ISU, SA 2152 63 543 CENIC-2152, US 23024 38 99 OCDE, US 3267 35 77 NIKS, RU 28614 32 38 Fundacao Universidade Regional de Blumenau, BR 46115 32 35 LUTHER, US 32440 31 56 LONI, US 25977 30 44 HCCS, US 27609 29 45 USC-UNIVERSITY-HOSPITAL, 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 14:92 18:39 23:12 24:3 31:1 35:10 37:9 38:13 40:1 41:215 42:18 44:4 45:40 46:4 47:1 49:8 50:4 52:1 58:15 59:20 60:6 61:3 62:6 63:36 64:46 65:20 66:52 67:43 68:18 69:17 70:2 71:1 72:8 74:53 76:36 77:9 78:3 79:9 80:13 81:24 82:6 83:8 84:5 85:51 86:2 87:1 89:10 91:40 92:2 93:14 94:2 95:2 96:5 97:1 98:2 101:3 102:10 103:345 104:77 107:2 108:8 109:5 111:21 113:1 114:24 116:7 117:61 118:33 119:31 121:28 122:8 123:8 124:42 125:5 128:58 129:43 130:99 131:63 132:67 133:156 134:105 136:200 137:100 138:10 139:12 140:32 141:3 142:26 143:25 144:31 145:2 146:138 147:27 148:42 149:11 150:69 151:13 152:125 153:15 154:45 155:80 156:129 157:24 158:28 159:117 160:32 161:15 162:30 163:59 164:11 165:43 166:2 167:29 168:103 169:7 170:26 171:1 172:2 173:6 174:1 175:16 177:5 179:13 180:16 181:1 182:12 184:2 185:48 186:3 187:24 188:14 189:3 190:17 191:13 192:1385 193:287 194:119 195:71 196:148 197:326 198:520 199:251 200:294 201:36 202:631 203:431 204:401 205:175 206:213 207:312 208:67 209:170 210:224 211:4 212:144 213:4 216:92 217:18 218:22 219:6 220:16 222:4 223:5 End of report