IPv4 R&E Routing Table Report 17:05 GMT Tue 10 Jun, 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: 13357 Prefixes after maximum aggregation (per Origin AS): 8027 Deaggregation factor: 1.66 Unique aggregates announced (without unneeded subnets): 8765 Number of IPv4 prefixes with a valid ROA: 5682 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7674 Total ASes present in the Internet Routing Table: 2046 Prefixes per ASN: 6.53 Origin-only ASes present in the Internet Routing Table: 1775 Origin ASes announcing only one prefix: 820 Transit ASes present in the Internet Routing Table: 271 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: 13 Max AS path prepend of ASN ( 43066) 9 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: 46631 Number of 32-bit ASNs visible in the Routing Table: 507 Prefixes from 32-bit ASNs in the Routing Table: 1285 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: 161178592 Equivalent to 9 /8s, 155 /16s and 99 /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: 1515 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3343 Total APNIC prefixes after maximum aggregation: 1691 APNIC Deaggregation factor: 1.98 Prefixes being announced from the APNIC address blocks: 3342 Unique aggregates announced from the APNIC address blocks: 1825 APNIC Region origin ASes present in the Internet Routing Table: 447 APNIC Prefixes per ASN: 7.48 APNIC Region origin ASes announcing only one prefix: 208 APNIC Region transit ASes present in the Internet Routing Table: 42 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: 199 Number of APNIC addresses announced to Internet: 37183296 Equivalent to 2 /8s, 55 /16s and 95 /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: 5777 Total ARIN prefixes after maximum aggregation: 3396 ARIN Deaggregation factor: 1.70 Prefixes being announced from the ARIN address blocks: 5822 Unique aggregates announced from the ARIN address blocks: 3788 ARIN Region origin ASes present in the Internet Routing Table: 902 ARIN Prefixes per ASN: 6.45 ARIN Region origin ASes announcing only one prefix: 319 ARIN Region transit ASes present in the Internet Routing Table: 112 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: 138 Number of ARIN addresses announced to Internet: 65650528 Equivalent to 3 /8s, 233 /16s and 191 /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: 3118 Total RIPE prefixes after maximum aggregation: 2589 RIPE Deaggregation factor: 1.20 Prefixes being announced from the RIPE address blocks: 3106 Unique aggregates announced from the RIPE address blocks: 2634 RIPE Region origin ASes present in the Internet Routing Table: 562 RIPE Prefixes per ASN: 5.53 RIPE Region origin ASes announcing only one prefix: 253 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: 132 Number of RIPE addresses announced to Internet: 56273792 Equivalent to 3 /8s, 90 /16s and 171 /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: 583 Total LACNIC prefixes after maximum aggregation: 293 LACNIC Deaggregation factor: 1.99 Prefixes being announced from the LACNIC address blocks: 582 Unique aggregates announced from the LACNIC address blocks: 433 LACNIC Region origin ASes present in the Internet Routing Table: 60 LACNIC Prefixes per ASN: 9.70 LACNIC Region origin ASes announcing only one prefix: 24 LACNIC Region transit ASes present in the Internet Routing Table: 15 Average LACNIC Region AS path length visible: 4.5 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 22 Number of LACNIC addresses announced to Internet: 1371328 Equivalent to 0 /8s, 20 /16s and 236 /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: 504 Total AfriNIC prefixes after maximum aggregation: 54 AfriNIC Deaggregation factor: 9.33 Prefixes being announced from the AfriNIC address blocks: 503 Unique aggregates announced from the AfriNIC address blocks: 83 AfriNIC Region origin ASes present in the Internet Routing Table: 30 AfriNIC Prefixes per ASN: 16.77 AfriNIC Region origin ASes announcing only one prefix: 16 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: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 16 Number of AfriNIC addresses announced to Internet: 697344 Equivalent to 0 /8s, 10 /16s and 164 /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 599 2170 463 SINET-AS Research Organization of Informa 7497 456 180 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 173 281 117 AARNET-AS-AP Australian Academic and Rese 55824 148 19 21 NKN-CORE-NW NKN Core Network, IN 6262 51 133 45 CSIRO Commonwealth Scientific and Industr 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 5786 199 16 1 UPRENET, PR 376 194 161 145 RISQ-AS, CA 2920 176 34 7 LACOE, US 2152 147 507 97 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 81 100 367 27 NCREN, US 23024 98 7 19 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 786 194 1742 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 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 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 63 614 58 FR-RENATER Reseau National de telecommuni 200521 57 4 24 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 259 61 112 Rede Nacional de Ensino e Pesquisa, BR 11340 109 25 52 Red Universitaria Nacional, CL 20191 26 16 1 Pontificia Universidad Catolica de Chile, 28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR 278 12 9 10 Universidad Nacional Autonoma de Mexico, 52888 11 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 61468 11 1 10 CEDIA, EC 10715 9 18 3 Universidade Federal de Santa Catarina, B 21612 9 1 8 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 262742 8 2 1 Fundacao Universidade Federal do ABC - UF 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 366 82 3 KENET-AS, KE 37215 36 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 327947 5 2 3 KNUST-, GH 327798 4 0 3 BERNET, BI 327992 3 1 2 GHANAIAN-ACADEMIC-AND-RESEARCH-NETWORK, G 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 599 2170 463 SINET-AS Research Organization of Informa 7497 456 180 24 CSTNET-AS-AP Computer Network Information 36914 366 82 3 KENET-AS, KE 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 1916 259 61 112 Rede Nacional de Ensino e Pesquisa, BR 5786 199 16 1 UPRENET, PR 376 194 161 145 RISQ-AS, CA 786 194 1742 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 456 432 CSTNET-AS-AP Computer Network Information Cente 36914 366 363 KENET-AS, KE 5786 199 198 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE, US 1916 259 147 Rede Nacional de Ensino e Pesquisa, BR 18558 139 135 NETBLK-RCOEK, US 55824 148 127 NKN-CORE-NW NKN Core Network, IN 4538 190 119 ERX-CERNET-BKB China Education and Research Net 23024 98 79 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 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 /13:16 /14:30 /15:99 /16:1596 /17:292 /18:306 /19:444 /20:564 /21:595 /22:1004 /23:1092 /24:7149 /25:51 /26:78 /27:30 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 348 366 KENET-AS, KE 1916 85 259 Rede Nacional de Ensino e Pesquisa, BR 23024 38 98 OCDE, US 200521 32 57 SEAP-AGE, ES 37215 30 36 MAREN, MW 25977 27 30 HCCS, US 32440 27 50 LONI, 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 14:93 23:4 24:2 31:1 35:1 37:9 38:4 40:1 41:105 42:13 44:4 45:25 46:5 47:1 49:12 58:16 59:17 60:6 61:2 62:5 63:3 64:30 66:19 67:31 68:2 69:10 70:2 72:7 74:16 76:27 77:6 78:3 79:9 80:8 81:9 82:2 83:7 84:6 85:31 87:1 89:10 91:36 93:15 94:2 95:1 96:5 98:2 101:2 102:3 103:291 104:74 108:4 109:1 111:17 114:1 116:6 118:34 119:31 121:28 122:8 123:8 124:42 128:31 129:34 130:95 131:56 132:56 133:156 134:75 136:198 137:47 138:10 139:4 140:26 141:2 142:24 143:14 144:7 145:2 146:122 147:14 148:9 149:12 150:11 151:5 152:78 153:13 154:21 155:37 156:128 157:11 158:27 159:116 160:33 161:12 162:15 163:61 164:10 165:3 167:9 168:12 169:6 170:12 172:1 173:5 177:1 179:10 180:16 182:1 184:7 185:36 187:6 188:13 190:2 191:2 192:1152 193:251 194:85 195:67 196:11 197:279 198:338 199:194 200:175 201:2 202:341 203:187 204:319 205:97 206:160 207:198 208:46 209:91 210:107 211:2 212:43 213:4 216:52 217:22 219:7 222:3 223:6 End of report