IPv4 R&E Routing Table Report 20:00 GMT Tue 11 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: 19099 Prefixes after maximum aggregation (per Origin AS): 10701 Deaggregation factor: 1.78 Unique aggregates announced (without unneeded subnets): 11815 Number of IPv4 prefixes with a valid ROA: 7999 Number of IPv4 prefixes with an invalid ROA: 3 Number of IPv4 prefixes with no ROA: 11097 Total ASes present in the Internet Routing Table: 2793 Prefixes per ASN: 6.84 Origin-only ASes present in the Internet Routing Table: 2416 Origin ASes announcing only one prefix: 1083 Transit ASes present in the Internet Routing Table: 377 Transit-only ASes present in the Internet Routing Table: 63 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: 47952 Number of 32-bit ASNs visible in the Routing Table: 712 Prefixes from 32-bit ASNs in the Routing Table: 1902 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: 198139648 Equivalent to 11 /8s, 207 /16s and 95 /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: 2294 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4742 Total APNIC prefixes after maximum aggregation: 2341 APNIC Deaggregation factor: 2.03 Prefixes being announced from the APNIC address blocks: 4738 Unique aggregates announced from the APNIC address blocks: 2596 APNIC Region origin ASes present in the Internet Routing Table: 594 APNIC Prefixes per ASN: 7.98 APNIC Region origin ASes announcing only one prefix: 246 APNIC Region transit ASes present in the Internet Routing Table: 52 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: 239 Number of APNIC addresses announced to Internet: 45398272 Equivalent to 2 /8s, 180 /16s and 185 /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: 8685 Total ARIN prefixes after maximum aggregation: 4869 ARIN Deaggregation factor: 1.78 Prefixes being announced from the ARIN address blocks: 8709 Unique aggregates announced from the ARIN address blocks: 5417 ARIN Region origin ASes present in the Internet Routing Table: 1288 ARIN Prefixes per ASN: 6.76 ARIN Region origin ASes announcing only one prefix: 453 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: 89926912 Equivalent to 5 /8s, 92 /16s and 45 /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: 3642 Total RIPE prefixes after maximum aggregation: 2896 RIPE Deaggregation factor: 1.26 Prefixes being announced from the RIPE address blocks: 3628 Unique aggregates announced from the RIPE address blocks: 2974 RIPE Region origin ASes present in the Internet Routing Table: 664 RIPE Prefixes per ASN: 5.46 RIPE Region origin ASes announcing only one prefix: 300 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: 58043904 Equivalent to 3 /8s, 117 /16s and 174 /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: 1227 Total LACNIC prefixes after maximum aggregation: 486 LACNIC Deaggregation factor: 2.52 Prefixes being announced from the LACNIC address blocks: 1227 Unique aggregates announced from the LACNIC address blocks: 659 LACNIC Region origin ASes present in the Internet Routing Table: 132 LACNIC Prefixes per ASN: 9.30 LACNIC Region origin ASes announcing only one prefix: 57 LACNIC Region transit ASes present in the Internet Routing Table: 24 Average LACNIC Region AS path length visible: 6.0 Max LACNIC Region AS path length visible: 15 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 59 Number of LACNIC addresses announced to Internet: 3997696 Equivalent to 0 /8s, 61 /16s and 0 /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: 792 Total AfriNIC prefixes after maximum aggregation: 106 AfriNIC Deaggregation factor: 7.47 Prefixes being announced from the AfriNIC address blocks: 791 Unique aggregates announced from the AfriNIC address blocks: 163 AfriNIC Region origin ASes present in the Internet Routing Table: 49 AfriNIC Prefixes per ASN: 16.14 AfriNIC Region origin ASes announcing only one prefix: 27 AfriNIC Region transit ASes present in the Internet Routing Table: 9 Average AfriNIC Region AS path length visible: 6.3 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 33 Number of AfriNIC addresses announced to Internet: 769536 Equivalent to 0 /8s, 11 /16s and 190 /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 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 4621 62 36 8 UNINET-AS-AP UNINET-, TH 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 653 492 100 CENIC-2152, US 2920 228 44 49 LACOE, US 668 202 651 170 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 5786 177 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 559 114 533 104 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 563 82 3 KENET-AS, KE 2561 68 4 34 EUN, EG 37215 43 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 327700 12 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 327947 5 4 1 KNUST-, GH 30983 4 4 1 MARWAN-AS, MA 37661 4 6 4 NRaE1-AS, NG 327798 4 0 3 BERNET, BI 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 653 492 100 CENIC-2152, US 2907 600 2169 462 SINET-AS Research Organization of Informa 36914 563 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 2920 228 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 376 200 162 150 RISQ-AS, CA 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 563 560 KENET-AS, KE 7497 452 429 CSTNET-AS-AP Computer Network Information Cente 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 228 179 LACOE, US 5786 177 176 UPRENET, PR 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 4538 184 112 ERX-CERNET-BKB China Education and Research Net 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 /15:114 /16:1953 /17:383 /18:456 /19:593 /20:854 /21:882 /22:1453 /23:1616 /24:10730 /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 539 563 KENET-AS, KE 8895 100 103 ISU Internet Services Unit ISU, SA 2152 73 653 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 41:227 42:18 44:6 45:44 46:4 47:1 49:12 50:4 52:1 58:14 59:20 60:6 61:3 62:8 63:32 64:44 65:7 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 98:2 101:3 102:14 103:334 104:76 108:8 109:8 111:7 113:1 114:22 116:9 117:5 118:34 119:30 121:12 122:8 123:8 124:42 125:5 128:57 129:43 130:97 131:58 132:64 133:158 134:120 136:179 137:116 138:11 139:4 140:35 141:3 142:30 143:18 144:62 145:13 146:126 147:54 148:201 149:11 150:36 151:8 152:114 153:14 154:14 155:71 156:125 157:25 158:29 159:117 160:35 161:33 162:23 163:75 164:10 165:44 167:28 168:58 169:6 170:22 171:1 172:1 173:5 175:8 177:5 179:12 180:16 181:1 182:11 184:16 185:49 186:4 187:24 188:23 190:17 191:13 192:1418 193:337 194:141 195:101 196:12 197:350 198:563 199:279 200:301 201:22 202:617 203:447 204:411 205:186 206:208 207:342 208:41 209:147 210:224 211:4 212:141 213:4 214:8 216:91 217:23 218:20 219:7 220:16 222:4 223:17 End of report