IPv4 R&E Routing Table Report 17:05 GMT Sat 03 May, 2025 IPv4 BGP Table (R&E) as seen at ASREN. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/ASREN/ Analysis Summary ---------------- BGP routing table entries examined: 13700 Prefixes after maximum aggregation (per Origin AS): 8232 Deaggregation factor: 1.66 Unique aggregates announced (without unneeded subnets): 9081 Number of IPv4 prefixes with a valid ROA: 5711 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7988 Total ASes present in the Internet Routing Table: 2094 Prefixes per ASN: 6.54 Origin-only ASes present in the Internet Routing Table: 1816 Origin ASes announcing only one prefix: 844 Transit ASes present in the Internet Routing Table: 278 Transit-only ASes present in the Internet Routing Table: 47 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.5 Max AS path length visible: 20 Max AS path prepend of ASN (327947) 11 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: 46319 Number of 32-bit ASNs visible in the Routing Table: 523 Prefixes from 32-bit ASNs in the Routing Table: 1380 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: 162552800 Equivalent to 9 /8s, 176 /16s and 91 /24s Percentage of available address space announced: 4.4 Percentage of allocated address space announced: 4.4 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: 1517 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3445 Total APNIC prefixes after maximum aggregation: 1721 APNIC Deaggregation factor: 2.00 Prefixes being announced from the APNIC address blocks: 3445 Unique aggregates announced from the APNIC address blocks: 1877 APNIC Region origin ASes present in the Internet Routing Table: 454 APNIC Prefixes per ASN: 7.59 APNIC Region origin ASes announcing only one prefix: 209 APNIC Region transit ASes present in the Internet Routing Table: 41 Average APNIC Region AS path length visible: 4.1 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 201 Number of APNIC addresses announced to Internet: 37339456 Equivalent to 2 /8s, 57 /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: 5843 Total ARIN prefixes after maximum aggregation: 3434 ARIN Deaggregation factor: 1.70 Prefixes being announced from the ARIN address blocks: 5893 Unique aggregates announced from the ARIN address blocks: 3838 ARIN Region origin ASes present in the Internet Routing Table: 923 ARIN Prefixes per ASN: 6.38 ARIN Region origin ASes announcing only one prefix: 337 ARIN Region transit ASes present in the Internet Routing Table: 114 Average ARIN Region AS path length visible: 5.0 Max ARIN Region AS path length visible: 10 Number of ARIN region 32-bit ASNs visible in the Routing Table: 144 Number of ARIN addresses announced to Internet: 66047648 Equivalent to 3 /8s, 239 /16s and 206 /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: 3147 Total RIPE prefixes after maximum aggregation: 2600 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3133 Unique aggregates announced from the RIPE address blocks: 2651 RIPE Region origin ASes present in the Internet Routing Table: 567 RIPE Prefixes per ASN: 5.53 RIPE Region origin ASes announcing only one prefix: 251 RIPE Region transit ASes present in the Internet Routing Table: 90 Average RIPE Region AS path length visible: 3.8 Max RIPE Region AS path length visible: 13 Number of RIPE region 32-bit ASNs visible in the Routing Table: 135 Number of RIPE addresses announced to Internet: 56375936 Equivalent to 3 /8s, 92 /16s and 58 /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: 732 Total LACNIC prefixes after maximum aggregation: 418 LACNIC Deaggregation factor: 1.75 Prefixes being announced from the LACNIC address blocks: 728 Unique aggregates announced from the LACNIC address blocks: 632 LACNIC Region origin ASes present in the Internet Routing Table: 72 LACNIC Prefixes per ASN: 10.11 LACNIC Region origin ASes announcing only one prefix: 32 LACNIC Region transit ASes present in the Internet Routing Table: 16 Average LACNIC Region AS path length visible: 4.7 Max LACNIC Region AS path length visible: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 28 Number of LACNIC addresses announced to Internet: 2116736 Equivalent to 0 /8s, 32 /16s and 76 /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: 500 Total AfriNIC prefixes after maximum aggregation: 54 AfriNIC Deaggregation factor: 9.26 Prefixes being announced from the AfriNIC address blocks: 499 Unique aggregates announced from the AfriNIC address blocks: 81 AfriNIC Region origin ASes present in the Internet Routing Table: 29 AfriNIC Prefixes per ASN: 17.21 AfriNIC Region origin ASes announcing only one prefix: 15 AfriNIC Region transit ASes present in the Internet Routing Table: 7 Average AfriNIC Region AS path length visible: 5.8 Max AfriNIC Region AS path length visible: 20 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 15 Number of AfriNIC addresses announced to Internet: 670720 Equivalent to 0 /8s, 10 /16s and 60 /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 634 2170 464 SINET-AS Research Organization of Informa 7497 454 180 24 CSTNET-AS-AP Computer Network Information 4538 190 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 174 282 117 AARNET-AS-AP Australian Academic and Rese 55824 146 19 21 NKN-CORE-NW NKN Core Network, IN 2697 58 4 34 ERX-ERNET-AS Education and Research Netwo 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw 45773 48 3 5 HECPERN-AS-PK PERN AS Content Servie Prov 132524 42 9 10 TIFR-AS Tata Institute of Fundamental Res Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 376 199 162 149 RISQ-AS, CA 5786 199 16 1 UPRENET, PR 2920 169 34 7 LACOE, US 2152 147 507 97 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 81 100 361 27 NCREN, US 23024 99 7 17 OCDE, US 21976 88 34 14 NJEDGE-NET, US 1736 79 16 1 MU-AS, US 22742 67 37 32 CT-EDU-NET, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 786 195 1750 187 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Peering requests: peering@switch.c 1103 96 1487 83 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 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 63 614 58 FR-RENATER Reseau National de telecommuni 200521 56 4 26 SEAP-AGE, ES Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 265 59 135 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 52 Red Universitaria Nacional, CL 271640 67 4 30 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 45 83 34 Fundacao Carlos Chagas Filho de Amparo a 1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 20191 28 16 1 Pontificia Universidad Catolica de Chile, 28571 12 37 12 UNIVERSIDADE DE SAO PAULO, BR 52888 10 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 61468 10 1 9 CEDIA, EC 278 9 8 7 Universidad Nacional Autonoma de Mexico, Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 367 82 3 KENET-AS, KE 37215 34 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 327700 11 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 37661 9 6 3 NRaE1-AS, NG 327798 4 0 3 BERNET, BI 327947 4 1 4 KNUST-, GH 37496 2 0 1 Aga-Khan-University, TZ Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 634 2170 464 SINET-AS Research Organization of Informa 7497 454 180 24 CSTNET-AS-AP Computer Network Information 36914 367 82 3 KENET-AS, KE 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 1916 265 59 135 Rede Nacional de Ensino e Pesquisa, BR 376 199 162 149 RISQ-AS, CA 5786 199 16 1 UPRENET, PR 786 195 1750 187 JANET Jisc Services Limited, GB 4538 190 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 7497 454 430 CSTNET-AS-AP Computer Network Information Cente 36914 367 364 KENET-AS, KE 5786 199 198 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 169 162 LACOE, US 18558 139 135 NETBLK-RCOEK, US 1916 265 130 Rede Nacional de Ensino e Pesquisa, BR 55824 146 125 NKN-CORE-NW NKN Core Network, IN 4538 190 119 ERX-CERNET-BKB China Education and Research Net 23024 99 82 OCDE, US Complete listing at https://bgp.nsrc.org/REN/ASREN/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 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/ASREN/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/ASREN/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 /11:0 /12:9 /13:16 /14:30 /15:99 /16:1615 /17:297 /18:310 /19:448 /20:574 /21:606 /22:1025 /23:1113 /24:7394 /25:50 /26:80 /27:32 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 347 367 KENET-AS, KE 1916 85 265 Rede Nacional de Ensino e Pesquisa, BR 23024 38 99 OCDE, US 200521 31 56 SEAP-AGE, ES 32440 29 53 LONI, US 37215 28 34 MAREN, MW 25977 27 30 HCCS, US 26898 24 64 RESERVED, ZZ 36794 24 26 META SOLUTIONS PIKETON, US 60187 23 48 LGFL-AS, GB Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:16 8:2 12:1 14:92 23:3 24:2 31:1 37:9 38:4 40:1 41:106 42:13 44:3 45:25 46:4 47:1 49:8 58:16 59:17 60:6 61:2 62:5 63:3 64:30 66:16 67:31 68:1 69:10 70:2 72:7 74:16 76:29 77:6 78:3 79:9 80:8 81:23 82:3 83:7 84:6 85:31 87:1 89:10 91:36 93:14 94:2 95:2 96:5 98:2 101:2 102:2 103:294 104:76 108:4 109:1 111:17 114:3 116:6 117:1 118:33 119:31 121:28 122:8 123:8 124:42 128:33 129:35 130:94 131:53 132:53 133:156 134:75 136:198 137:46 138:10 139:10 140:26 141:2 142:25 143:14 144:24 145:2 146:123 147:15 148:9 149:11 150:38 151:5 152:112 153:14 154:20 155:40 156:128 157:11 158:27 159:116 160:34 161:8 162:17 163:61 164:12 165:3 167:10 168:35 169:6 170:13 172:2 173:5 177:1 179:9 180:16 182:3 184:6 185:36 186:2 187:8 188:12 190:1 191:2 192:1154 193:252 194:85 195:67 196:11 197:275 198:342 199:200 200:253 201:2 202:387 203:186 204:315 205:102 206:160 207:196 208:48 209:81 210:109 211:2 212:40 213:4 216:52 217:22 219:7 222:3 223:5 End of report