IPv4 R&E Routing Table Report 20:00 GMT Wed 12 Nov, 2025 IPv4 BGP Table (R&E) as seen at SingAREN. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/SingAREN/ Analysis Summary ---------------- BGP routing table entries examined: 19549 Prefixes after maximum aggregation (per Origin AS): 10814 Deaggregation factor: 1.81 Unique aggregates announced (without unneeded subnets): 11942 Number of IPv4 prefixes with a valid ROA: 8222 Number of IPv4 prefixes with an invalid ROA: 3 Number of IPv4 prefixes with no ROA: 11324 Total ASes present in the Internet Routing Table: 2807 Prefixes per ASN: 6.96 Origin-only ASes present in the Internet Routing Table: 2427 Origin ASes announcing only one prefix: 1091 Transit ASes present in the Internet Routing Table: 380 Transit-only ASes present in the Internet Routing Table: 64 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.8 Max AS path length visible: 27 Max AS path prepend of ASN (200323) 20 Prefixes from unregistered ASNs in the Routing Table: 11 Number of instances of unregistered ASNs: 11 Number of 32-bit ASNs allocated by the RIRs: 47971 Number of 32-bit ASNs visible in the Routing Table: 716 Prefixes from 32-bit ASNs in the Routing Table: 1909 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: 6 Number of addresses announced to Internet: 199949056 Equivalent to 11 /8s, 234 /16s and 251 /24s Percentage of available address space announced: 5.4 Percentage of allocated address space announced: 5.4 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: 2302 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4730 Total APNIC prefixes after maximum aggregation: 2344 APNIC Deaggregation factor: 2.02 Prefixes being announced from the APNIC address blocks: 4726 Unique aggregates announced from the APNIC address blocks: 2583 APNIC Region origin ASes present in the Internet Routing Table: 596 APNIC Prefixes per ASN: 7.93 APNIC Region origin ASes announcing only one prefix: 249 APNIC Region transit ASes present in the Internet Routing Table: 53 Average APNIC Region AS path length visible: 3.5 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 240 Number of APNIC addresses announced to Internet: 45460992 Equivalent to 2 /8s, 181 /16s and 174 /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: 8704 Total ARIN prefixes after maximum aggregation: 4870 ARIN Deaggregation factor: 1.79 Prefixes being announced from the ARIN address blocks: 8728 Unique aggregates announced from the ARIN address blocks: 5419 ARIN Region origin ASes present in the Internet Routing Table: 1289 ARIN Prefixes per ASN: 6.77 ARIN Region origin ASes announcing only one prefix: 454 ARIN Region transit ASes present in the Internet Routing Table: 160 Average ARIN Region AS path length visible: 5.6 Max ARIN Region AS path length visible: 17 Number of ARIN region 32-bit ASNs visible in the Routing Table: 219 Number of ARIN addresses announced to Internet: 89927424 Equivalent to 5 /8s, 92 /16s and 47 /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: 3644 Total RIPE prefixes after maximum aggregation: 2898 RIPE Deaggregation factor: 1.26 Prefixes being announced from the RIPE address blocks: 3630 Unique aggregates announced from the RIPE address blocks: 2976 RIPE Region origin ASes present in the Internet Routing Table: 665 RIPE Prefixes per ASN: 5.46 RIPE Region origin ASes announcing only one prefix: 301 RIPE Region transit ASes present in the Internet Routing Table: 111 Average RIPE Region AS path length visible: 3.8 Max RIPE Region AS path length visible: 27 Number of RIPE region 32-bit ASNs visible in the Routing Table: 162 Number of RIPE addresses announced to Internet: 58044416 Equivalent to 3 /8s, 117 /16s and 176 /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: 1213 Total LACNIC prefixes after maximum aggregation: 485 LACNIC Deaggregation factor: 2.50 Prefixes being announced from the LACNIC address blocks: 1213 Unique aggregates announced from the LACNIC address blocks: 658 LACNIC Region origin ASes present in the Internet Routing Table: 133 LACNIC Prefixes per ASN: 9.12 LACNIC Region origin ASes announcing only one prefix: 58 LACNIC Region transit ASes present in the Internet Routing Table: 24 Average LACNIC Region AS path length visible: 6.1 Max LACNIC Region AS path length visible: 15 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 60 Number of LACNIC addresses announced to Internet: 3997440 Equivalent to 0 /8s, 60 /16s and 255 /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: 1247 Total AfriNIC prefixes after maximum aggregation: 214 AfriNIC Deaggregation factor: 5.83 Prefixes being announced from the AfriNIC address blocks: 1246 Unique aggregates announced from the AfriNIC address blocks: 300 AfriNIC Region origin ASes present in the Internet Routing Table: 57 AfriNIC Prefixes per ASN: 21.86 AfriNIC Region origin ASes announcing only one prefix: 29 AfriNIC Region transit ASes present in the Internet Routing Table: 11 Average AfriNIC Region AS path length visible: 5.5 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 35 Number of AfriNIC addresses announced to Internet: 2515456 Equivalent to 0 /8s, 38 /16s and 98 /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 600 2169 462 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 1237 199 72 153 KREONET-AS-KR KISTI, KR 4538 184 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 167 281 113 AARNET-AS-AP Australian Academic and Rese 55824 152 19 21 NKN-CORE-NW NKN Core Network, IN 4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha 4621 64 37 9 UNINET-AS-AP UNINET-, TH 6262 63 134 56 CSIRO Commonwealth Scientific and Industr Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 2152 652 492 100 CENIC-2152, US 2920 229 44 49 LACOE, US 668 202 651 170 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 5786 198 16 1 UPRENET, PR 18558 138 18 5 NETBLK-RCOEK, US 81 118 471 35 NCREN, US 21976 90 34 16 NJEDGE-NET, US 237 83 542 49 MERIT-AS-14, US 1736 79 16 1 MU-AS, US Complete listing at https://bgp.nsrc.org/REN/SingAREN/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 786 213 1739 190 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 8895 103 24 5 ISU Internet Services Unit ISU, SA 1103 100 1759 85 SURFNET-NL SURFnet, The Netherlands, NL 2614 88 26 68 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 3267 80 29 69 NIKS, RU 1930 77 88 72 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 205 177 41 Rede Nacional de Ensino e Pesquisa, BR 28391 159 10 71 Universidad Juarez Autonoma de Tabasco, M 11340 111 25 50 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 56 84 39 Fundacao Carlos Chagas Filho de Amparo a 61468 52 3 21 CEDIA, EC 19611 50 17 2 Associacao Antonio Vieira - Unisinos, BR 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 Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 567 82 3 KENET-AS, KE 2018 375 318 69 TENET-1, ZA 2561 68 4 34 EUN, EG 8094 47 48 18 PUKNET, ZA 37215 43 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 327700 12 16 1 MoRENet, MZ 37501 11 49 6 UOFS, ZA 37654 10 1 6 RwEdNet-AS, RW 36982 8 33 8 UCT, ZA Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2152 652 492 100 CENIC-2152, US 2907 600 2169 462 SINET-AS Research Organization of Informa 36914 567 82 3 KENET-AS, KE 7497 452 180 23 CSTNET-AS-AP Computer Network Information 2018 375 318 69 TENET-1, ZA 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 2920 229 44 49 LACOE, US 786 213 1739 190 JANET Jisc Services Limited, GB 1916 205 177 41 Rede Nacional de Ensino e Pesquisa, BR 668 202 651 170 DNIC-AS-00668, US Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 567 564 KENET-AS, KE 7497 452 429 CSTNET-AS-AP Computer Network Information Cente 2018 375 306 TENET-1, ZA 5786 198 197 UPRENET, PR 2920 229 180 LACOE, US 58647 182 180 KAGAWAU-AS Kagawa University, JP 1916 205 164 Rede Nacional de Ensino e Pesquisa, BR 2907 600 138 SINET-AS Research Organization of Information a 18558 138 133 NETBLK-RCOEK, US 55824 152 131 NKN-CORE-NW NKN Core Network, IN Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US 64011 UNALLOCATED 130.215.0.0/16 10326 WPI, US 396334 UNALLOCATED 205.143.136.0/21 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.136.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.137.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.138.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.139.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.140.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.141.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.142.0/24 5078 ONENET-AS-1, US Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 162.212.34.0/24 Origin: 54048 CVIN, US 162.212.34.0/24 Transit: 2152 CENIC-2152, US 164.160.192.0/21 Origin: 37661 NRaE1-AS, NG 164.160.192.0/21 Transit: 37288 WACREN, SN 165.101.120.0/24 Origin: 150725 NUS-AS-AP National University of Singapo 165.101.120.0/24 Transit: 23855 SINGAREN-GIX-AS-AP Singapore Advanced Re 202.46.245.0/24 Origin: 147171 IDNIC-BRIN-AS-ID Badan Riset dan Inovasi 202.46.245.0/24 Transit: 64302 IDNIC-IDREN-AS-ID IDREN - Indonesia Rese 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/SingAREN/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 /11:1 /12:11 /13:18 /14:33 /15:115 /16:1974 /17:414 /18:464 /19:599 /20:861 /21:901 /22:1495 /23:1648 /24:11013 /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 543 567 KENET-AS, KE 8895 100 103 ISU Internet Services Unit ISU, SA 2152 73 652 CENIC-2152, US 31638 48 48 ASN-LEPIDA, IT 37215 37 43 MAREN, MW 3267 35 80 NIKS, RU 200521 34 59 SEAP-AGE, ES 28614 32 38 Fundacao Universidade Regional de Blumenau, BR 46115 32 35 LUTHER, US 25977 30 44 HCCS, US Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:18 6:4 8:2 12:2 14:95 23:9 24:3 31:1 35:3 37:26 38:12 40:1 41:230 42:18 44:6 45:45 46:4 47:1 49:12 50:4 52:1 58:14 59:20 60:6 61:3 62:8 63:32 64:44 65:6 66:58 67:42 68:13 69:17 70:3 71:1 72:6 74:56 76:27 77:10 78:3 79:9 80:11 81:27 82:6 83:6 84:8 85:48 86:7 87:1 89:16 91:38 92:2 93:14 94:1 95:2 96:5 97:1 98:2 101:3 102:15 103:335 104:76 108:8 109:8 111:7 113:1 114:22 116:9 117:5 118:34 119:30 121:12 122:8 123:8 124:42 125:5 128:57 129:44 130:97 131:58 132:51 133:158 134:120 136:199 137:116 138:11 139:4 140:35 141:3 142:30 143:25 144:62 145:13 146:137 147:54 148:201 149:11 150:36 151:8 152:123 153:14 154:40 155:86 156:126 157:25 158:28 159:117 160:35 161:33 162:23 163:75 164:10 165:44 167:28 168:103 169:6 170:19 171:1 172:1 173:5 175:8 177:5 179:12 180:16 181:1 182:11 184:16 185:49 186:4 187:24 188:23 190:17 191:13 192:1439 193:337 194:141 195:102 196:150 197:351 198:578 199:278 200:301 201:22 202:617 203:432 204:411 205:186 206:207 207:342 208:41 209:147 210:224 211:4 212:141 213:4 214:9 216:91 217:23 218:20 219:7 220:16 222:4 223:17 End of report