IPv4 R&E Routing Table Report 17:05 GMT Sun 14 Sep, 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: 13031 Prefixes after maximum aggregation (per Origin AS): 7823 Deaggregation factor: 1.67 Unique aggregates announced (without unneeded subnets): 8622 Number of IPv4 prefixes with a valid ROA: 5725 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 7305 Total ASes present in the Internet Routing Table: 1993 Prefixes per ASN: 6.54 Origin-only ASes present in the Internet Routing Table: 1725 Origin ASes announcing only one prefix: 822 Transit ASes present in the Internet Routing Table: 268 Transit-only ASes present in the Internet Routing Table: 39 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: 14 Max AS path prepend of ASN ( 30116) 10 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: 47419 Number of 32-bit ASNs visible in the Routing Table: 520 Prefixes from 32-bit ASNs in the Routing Table: 1330 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: 154709344 Equivalent to 9 /8s, 56 /16s and 173 /24s Percentage of available address space announced: 4.2 Percentage of allocated address space announced: 4.2 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: 1623 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3377 Total APNIC prefixes after maximum aggregation: 1754 APNIC Deaggregation factor: 1.93 Prefixes being announced from the APNIC address blocks: 3375 Unique aggregates announced from the APNIC address blocks: 1860 APNIC Region origin ASes present in the Internet Routing Table: 445 APNIC Prefixes per ASN: 7.58 APNIC Region origin ASes announcing only one prefix: 201 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: 203 Number of APNIC addresses announced to Internet: 37658976 Equivalent to 2 /8s, 62 /16s and 161 /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: 5293 Total ARIN prefixes after maximum aggregation: 3129 ARIN Deaggregation factor: 1.69 Prefixes being announced from the ARIN address blocks: 5339 Unique aggregates announced from the ARIN address blocks: 3561 ARIN Region origin ASes present in the Internet Routing Table: 857 ARIN Prefixes per ASN: 6.23 ARIN Region origin ASes announcing only one prefix: 321 ARIN Region transit ASes present in the Internet Routing Table: 113 Average ARIN Region AS path length visible: 5.1 Max ARIN Region AS path length visible: 14 Number of ARIN region 32-bit ASNs visible in the Routing Table: 139 Number of ARIN addresses announced to Internet: 59110688 Equivalent to 3 /8s, 133 /16s and 245 /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: 3191 Total RIPE prefixes after maximum aggregation: 2613 RIPE Deaggregation factor: 1.22 Prefixes being announced from the RIPE address blocks: 3179 Unique aggregates announced from the RIPE address blocks: 2677 RIPE Region origin ASes present in the Internet Routing Table: 573 RIPE Prefixes per ASN: 5.55 RIPE Region origin ASes announcing only one prefix: 260 RIPE Region transit ASes present in the Internet Routing Table: 91 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: 141 Number of RIPE addresses announced to Internet: 56409472 Equivalent to 3 /8s, 92 /16s and 189 /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: 477 Total LACNIC prefixes after maximum aggregation: 256 LACNIC Deaggregation factor: 1.86 Prefixes being announced from the LACNIC address blocks: 476 Unique aggregates announced from the LACNIC address blocks: 426 LACNIC Region origin ASes present in the Internet Routing Table: 34 LACNIC Prefixes per ASN: 14.00 LACNIC Region origin ASes announcing only one prefix: 13 LACNIC Region transit ASes present in the Internet Routing Table: 12 Average LACNIC Region AS path length visible: 4.3 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 7 Number of LACNIC addresses announced to Internet: 856416 Equivalent to 0 /8s, 13 /16s and 17 /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: 661 Total AfriNIC prefixes after maximum aggregation: 67 AfriNIC Deaggregation factor: 9.87 Prefixes being announced from the AfriNIC address blocks: 660 Unique aggregates announced from the AfriNIC address blocks: 96 AfriNIC Region origin ASes present in the Internet Routing Table: 44 AfriNIC Prefixes per ASN: 15.00 AfriNIC Region origin ASes announcing only one prefix: 27 AfriNIC Region transit ASes present in the Internet Routing Table: 7 Average AfriNIC Region AS path length visible: 6.2 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 30 Number of AfriNIC addresses announced to Internet: 671488 Equivalent to 0 /8s, 10 /16s and 63 /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 179 18 2 KAGAWAU-AS Kagawa University, JP 7575 170 281 114 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 132524 42 8 9 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 198 16 1 UPRENET, PR 2920 178 34 7 LACOE, US 2152 148 491 97 CENIC-2152, US 18558 138 18 4 NETBLK-RCOEK, US 21976 88 34 14 NJEDGE-NET, US 376 79 6 56 RISQ-AS, CA 1736 79 16 1 MU-AS, US 3477 71 77 33 NOAA-NWAVE, US 22742 70 37 32 CT-EDU-NET, US 81 66 228 17 NCREN, 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 680 283 1883 250 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 77 88 72 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 64 630 59 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 246 51 124 Rede Nacional de Ensino e Pesquisa, BR 11340 110 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 11 9 9 Universidad Nacional Autonoma de Mexico, 28027 7 2 1 Escuela Superior Politecnica del Litoral, 52888 6 7 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR 52992 5 5 5 UNIVERSIDADE FEDERAL DE SAO PAULO, BR 27817 4 1 4 Red Nacional Academica de Tecnologia Avan 61468 4 0 3 CEDIA, EC 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 503 82 3 KENET-AS, KE 37215 39 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 6 4 1 KNUST-, GH 37404 4 0 1 University-of-Ibadan, NG 37661 4 6 4 NRaE1-AS, NG 327798 4 0 3 BERNET, BI 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 36914 503 82 3 KENET-AS, KE 7497 452 180 23 CSTNET-AS-AP Computer Network Information 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 1916 246 51 124 Rede Nacional de Ensino e Pesquisa, BR 5786 198 16 1 UPRENET, PR 786 190 1742 185 JANET Jisc Services Limited, GB 4538 183 4192 71 ERX-CERNET-BKB China Education and Resear 58647 179 18 2 KAGAWAU-AS Kagawa University, JP 2920 178 34 7 LACOE, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 503 500 KENET-AS, KE 7497 452 429 CSTNET-AS-AP Computer Network Information Cente 5786 198 197 UPRENET, PR 58647 179 177 KAGAWAU-AS Kagawa University, JP 2920 178 171 LACOE, US 18558 138 134 NETBLK-RCOEK, US 55824 149 128 NKN-CORE-NW NKN Core Network, IN 1916 246 122 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 /13:16 /14:30 /15:96 /16:1514 /17:261 /18:276 /19:392 /20:527 /21:596 /22:987 /23:1083 /24:7061 /25:56 /26:79 /27:46 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 479 503 KENET-AS, KE 1916 87 246 Rede Nacional de Ensino e Pesquisa, BR 31638 44 44 ASN-LEPIDA, IT 37215 33 39 MAREN, MW 200521 33 58 SEAP-AGE, ES 25977 28 42 HCCS, US 60187 25 50 LGFL-AS, GB 26898 24 64 RESERVED, ZZ 22742 20 70 CT-EDU-NET, US 32440 20 28 LONI, US Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:18 8:1 12:1 14:92 23:5 24:2 31:1 35:4 37:26 38:2 40:1 41:168 42:13 44:5 45:21 46:5 47:1 49:12 50:1 58:15 59:17 60:6 62:5 63:3 64:26 65:3 66:16 67:32 68:3 69:11 70:2 72:7 74:13 76:13 77:6 78:3 79:9 80:8 81:27 82:2 83:7 84:6 85:28 87:1 89:15 91:36 93:15 94:2 95:2 96:5 98:2 101:3 102:10 103:275 104:69 108:4 109:1 110:1 111:1 114:1 118:33 119:31 121:11 122:8 124:42 128:35 129:35 130:84 131:53 132:53 133:153 134:78 136:196 137:44 138:11 139:5 140:11 141:1 142:21 143:11 144:40 145:12 146:122 147:11 148:9 149:11 150:7 151:8 152:63 153:14 154:15 155:48 156:128 157:7 158:28 159:116 160:32 161:12 162:13 163:72 164:10 165:4 167:7 168:35 169:5 170:13 173:5 175:4 179:3 180:16 182:2 184:18 185:40 187:2 188:19 191:1 192:1118 193:249 194:87 195:68 196:11 197:350 198:304 199:185 200:161 202:381 203:184 204:304 205:62 206:122 207:187 208:47 209:50 210:102 211:2 212:42 213:4 216:45 217:23 219:6 222:3 223:5 End of report