IPv4 R&E Routing Table Report 17:05 GMT Sun 17 Aug, 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: 13182 Prefixes after maximum aggregation (per Origin AS): 7920 Deaggregation factor: 1.66 Unique aggregates announced (without unneeded subnets): 8685 Number of IPv4 prefixes with a valid ROA: 5656 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7525 Total ASes present in the Internet Routing Table: 2030 Prefixes per ASN: 6.49 Origin-only ASes present in the Internet Routing Table: 1757 Origin ASes announcing only one prefix: 834 Transit ASes present in the Internet Routing Table: 273 Transit-only ASes present in the Internet Routing Table: 44 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: 15 Max AS path prepend of ASN (327947) 11 Prefixes from unregistered ASNs in the Routing Table: 32 Number of instances of unregistered ASNs: 32 Number of 32-bit ASNs allocated by the RIRs: 47200 Number of 32-bit ASNs visible in the Routing Table: 523 Prefixes from 32-bit ASNs in the Routing Table: 1326 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: 158388416 Equivalent to 9 /8s, 112 /16s and 208 /24s Percentage of available address space announced: 4.3 Percentage of allocated address space announced: 4.3 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: 1560 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3455 Total APNIC prefixes after maximum aggregation: 1759 APNIC Deaggregation factor: 1.96 Prefixes being announced from the APNIC address blocks: 3453 Unique aggregates announced from the APNIC address blocks: 1915 APNIC Region origin ASes present in the Internet Routing Table: 451 APNIC Prefixes per ASN: 7.66 APNIC Region origin ASes announcing only one prefix: 209 APNIC Region transit ASes present in the Internet Routing Table: 43 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: 202 Number of APNIC addresses announced to Internet: 37669472 Equivalent to 2 /8s, 62 /16s and 202 /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: 5484 Total ARIN prefixes after maximum aggregation: 3230 ARIN Deaggregation factor: 1.70 Prefixes being announced from the ARIN address blocks: 5529 Unique aggregates announced from the ARIN address blocks: 3592 ARIN Region origin ASes present in the Internet Routing Table: 884 ARIN Prefixes per ASN: 6.25 ARIN Region origin ASes announcing only one prefix: 319 ARIN Region transit ASes present in the Internet Routing Table: 118 Average ARIN Region AS path length visible: 5.0 Max ARIN Region AS path length visible: 14 Number of ARIN region 32-bit ASNs visible in the Routing Table: 146 Number of ARIN addresses announced to Internet: 62857344 Equivalent to 3 /8s, 191 /16s and 32 /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: 3151 Total RIPE prefixes after maximum aggregation: 2601 RIPE Deaggregation factor: 1.21 Prefixes being announced from the RIPE address blocks: 3140 Unique aggregates announced from the RIPE address blocks: 2650 RIPE Region origin ASes present in the Internet Routing Table: 570 RIPE Prefixes per ASN: 5.51 RIPE Region origin ASes announcing only one prefix: 259 RIPE Region transit ASes present in the Internet Routing Table: 88 Average RIPE Region AS path length visible: 3.8 Max RIPE Region AS path length visible: 12 Number of RIPE region 32-bit ASNs visible in the Routing Table: 137 Number of RIPE addresses announced to Internet: 56385408 Equivalent to 3 /8s, 92 /16s and 95 /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: 491 Total LACNIC prefixes after maximum aggregation: 263 LACNIC Deaggregation factor: 1.87 Prefixes being announced from the LACNIC address blocks: 490 Unique aggregates announced from the LACNIC address blocks: 434 LACNIC Region origin ASes present in the Internet Routing Table: 37 LACNIC Prefixes per ASN: 13.24 LACNIC Region origin ASes announcing only one prefix: 16 LACNIC Region transit ASes present in the Internet Routing Table: 14 Average LACNIC Region AS path length visible: 4.4 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 8 Number of LACNIC addresses announced to Internet: 821088 Equivalent to 0 /8s, 12 /16s and 135 /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: 569 Total AfriNIC prefixes after maximum aggregation: 63 AfriNIC Deaggregation factor: 9.03 Prefixes being announced from the AfriNIC address blocks: 568 Unique aggregates announced from the AfriNIC address blocks: 92 AfriNIC Region origin ASes present in the Internet Routing Table: 43 AfriNIC Prefixes per ASN: 13.21 AfriNIC Region origin ASes announcing only one prefix: 31 AfriNIC Region transit ASes present in the Internet Routing Table: 6 Average AfriNIC Region AS path length visible: 5.8 Max AfriNIC Region AS path length visible: 15 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 30 Number of AfriNIC addresses announced to Internet: 652800 Equivalent to 0 /8s, 9 /16s and 246 /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 604 2169 462 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 4538 183 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 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 2697 56 4 33 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 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 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 81 100 323 32 NCREN, US 21976 88 34 14 NJEDGE-NET, US 376 79 6 56 RISQ-AS, CA 1736 79 16 1 MU-AS, US 22742 68 37 32 CT-EDU-NET, US 1706 65 53 55 UNIV-ARIZ, 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 680 286 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 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 200521 58 4 27 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 247 51 124 Rede Nacional de Ensino e Pesquisa, BR 11340 111 25 50 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 18 40 18 UNIVERSIDADE DE SAO PAULO, BR 278 12 1 11 Universidad Nacional Autonoma de Mexico, 52888 10 7 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 61468 10 1 9 CEDIA, EC 28027 8 2 2 Escuela Superior Politecnica del Litoral, 27817 4 1 4 Red Nacional Academica de Tecnologia Avan 3596 3 0 3 Universidad Autonoma Metropolitana, MX 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 421 82 3 KENET-AS, KE 37215 38 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 327947 7 4 1 KNUST-, GH 327798 4 0 3 BERNET, BI 328903 4 0 1 RITER, CI 37661 3 6 3 NRaE1-AS, NG 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 604 2169 462 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 36914 421 82 3 KENET-AS, KE 680 286 1883 252 DFN Verein zur Foerderung eines Deutschen 1916 247 51 124 Rede Nacional de Ensino e Pesquisa, BR 786 190 1742 185 JANET Jisc Services Limited, GB 4538 183 4192 71 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 2920 178 34 7 LACOE, US 5786 171 16 1 UPRENET, PR 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 452 429 CSTNET-AS-AP Computer Network Information Cente 36914 421 418 KENET-AS, KE 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 1916 247 123 Rede Nacional de Ensino e Pesquisa, BR 4538 183 112 ERX-CERNET-BKB China Education and Research Net 1736 79 78 MU-AS, 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 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 26898 UNALLOCATED 208.108.82.0/24 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 /13:15 /14:30 /15:97 /16:1568 /17:277 /18:300 /19:415 /20:569 /21:593 /22:978 /23:1097 /24:7049 /25:56 /26:79 /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 398 421 KENET-AS, KE 1916 88 247 Rede Nacional de Ensino e Pesquisa, BR 200521 33 58 SEAP-AGE, ES 37215 32 38 MAREN, MW 25977 27 30 HCCS, US 32440 27 39 LONI, US 26898 24 64 RESERVED, ZZ 36794 24 26 META SOLUTIONS PIKETON, US 60187 23 48 LGFL-AS, GB 31638 21 21 ASN-LEPIDA, IT 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 14:93 23:4 24:2 31:1 35:1 37:14 38:3 40:1 41:129 42:13 44:5 45:24 46:5 47:1 49:12 58:15 59:17 60:6 62:5 63:3 64:29 65:3 66:15 67:32 68:2 69:12 70:2 72:7 74:11 76:22 77:6 78:3 79:9 80:8 81:26 82:2 83:7 84:6 85:28 87:1 89:9 91:36 93:15 94:2 95:1 96:5 98:2 101:2 102:11 103:285 104:72 108:4 109:1 111:17 114:1 118:33 119:31 121:28 122:8 123:8 124:42 128:31 129:32 130:94 131:53 132:52 133:156 134:79 136:170 137:44 138:11 139:5 140:25 141:1 142:21 143:12 144:22 145:4 146:123 147:13 148:8 149:10 150:7 151:4 152:76 153:13 154:14 155:39 156:128 157:4 158:25 159:116 160:32 161:6 162:15 163:72 164:8 165:3 167:9 168:35 169:5 170:9 173:5 175:4 179:3 180:16 182:2 184:6 185:39 187:5 188:14 190:1 191:2 192:1142 193:248 194:87 195:68 196:10 197:305 198:320 199:193 200:162 202:385 203:186 204:304 205:58 206:138 207:195 208:47 209:64 210:102 211:2 212:42 213:4 216:47 217:22 219:6 220:3 222:3 223:5 End of report