IPv4 R&E Routing Table Report 20:00 GMT Sun 24 May, 2026 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: 19134 Prefixes after maximum aggregation (per Origin AS): 10536 Deaggregation factor: 1.82 Unique aggregates announced (without unneeded subnets): 11577 Number of IPv4 prefixes with a valid ROA: 8083 Number of IPv4 prefixes with an invalid ROA: 193 Number of IPv4 prefixes with no ROA: 10858 Total ASes present in the Internet Routing Table: 2703 Prefixes per ASN: 7.08 Origin-only ASes present in the Internet Routing Table: 2340 Origin ASes announcing only one prefix: 1043 Transit ASes present in the Internet Routing Table: 363 Transit-only ASes present in the Internet Routing Table: 59 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: 17 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 3 Number of instances of unregistered ASNs: 3 Number of 32-bit ASNs allocated by the RIRs: 49891 Number of 32-bit ASNs visible in the Routing Table: 696 Prefixes from 32-bit ASNs in the Routing Table: 1953 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: 1 Number of addresses announced to Internet: 197232128 Equivalent to 11 /8s, 193 /16s and 134 /24s Percentage of available address space announced: 5.3 Percentage of allocated address space announced: 5.3 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: 2132 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4773 Total APNIC prefixes after maximum aggregation: 2341 APNIC Deaggregation factor: 2.04 Prefixes being announced from the APNIC address blocks: 4775 Unique aggregates announced from the APNIC address blocks: 2629 APNIC Region origin ASes present in the Internet Routing Table: 591 APNIC Prefixes per ASN: 8.08 APNIC Region origin ASes announcing only one prefix: 254 APNIC Region transit ASes present in the Internet Routing Table: 52 Average APNIC Region AS path length visible: 3.6 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 246 Number of APNIC addresses announced to Internet: 44847616 Equivalent to 2 /8s, 172 /16s and 82 /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: 8726 Total ARIN prefixes after maximum aggregation: 4889 ARIN Deaggregation factor: 1.78 Prefixes being announced from the ARIN address blocks: 8739 Unique aggregates announced from the ARIN address blocks: 5440 ARIN Region origin ASes present in the Internet Routing Table: 1291 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: 162 Average ARIN Region AS path length visible: 5.7 Max ARIN Region AS path length visible: 17 Number of ARIN region 32-bit ASNs visible in the Routing Table: 225 Number of ARIN addresses announced to Internet: 88852736 Equivalent to 5 /8s, 75 /16s and 201 /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, 393216-404380 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: 3403 Total RIPE prefixes after maximum aggregation: 2714 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3391 Unique aggregates announced from the RIPE address blocks: 2763 RIPE Region origin ASes present in the Internet Routing Table: 598 RIPE Prefixes per ASN: 5.67 RIPE Region origin ASes announcing only one prefix: 267 RIPE Region transit ASes present in the Internet Routing Table: 102 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: 152 Number of RIPE addresses announced to Internet: 57276928 Equivalent to 3 /8s, 105 /16s and 250 /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: 1018 Total LACNIC prefixes after maximum aggregation: 389 LACNIC Deaggregation factor: 2.62 Prefixes being announced from the LACNIC address blocks: 1017 Unique aggregates announced from the LACNIC address blocks: 466 LACNIC Region origin ASes present in the Internet Routing Table: 118 LACNIC Prefixes per ASN: 8.62 LACNIC Region origin ASes announcing only one prefix: 48 LACNIC Region transit ASes present in the Internet Routing Table: 21 Average LACNIC Region AS path length visible: 5.7 Max LACNIC Region AS path length visible: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 52 Number of LACNIC addresses announced to Internet: 3800064 Equivalent to 0 /8s, 57 /16s and 252 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-275868 + 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: 1211 Total AfriNIC prefixes after maximum aggregation: 200 AfriNIC Deaggregation factor: 6.05 Prefixes being announced from the AfriNIC address blocks: 1211 Unique aggregates announced from the AfriNIC address blocks: 278 AfriNIC Region origin ASes present in the Internet Routing Table: 43 AfriNIC Prefixes per ASN: 28.16 AfriNIC Region origin ASes announcing only one prefix: 20 AfriNIC Region transit ASes present in the Internet Routing Table: 10 Average AfriNIC Region AS path length visible: 5.8 Max AfriNIC Region AS path length visible: 10 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 21 Number of AfriNIC addresses announced to Internet: 2454528 Equivalent to 0 /8s, 37 /16s and 116 /24s AfriNIC AS Blocks 36864-37887, 327680-330751 & 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 606 2153 464 SINET-AS Research Organization of Informa 7497 466 212 24 CSTNET-AS-AP Computer Network Information 1659 228 1246 54 ERX-TANET-ASN1 Taiwan Academic Network TA 1237 199 72 154 KREONET-AS-KR KISTI, KR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 181 4191 71 ERX-CERNET-BKB China Education and Resear 7575 166 281 113 AARNET-AS-AP Australian Academic and Rese 55824 152 19 20 NKN-CORE-NW NKN Core Network, IN 4762 64 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha 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 693 491 97 CENIC-2152 - CENIC, US 2920 226 44 49 LACOE - Los Angeles County Office of Educ 5786 197 16 1 UPRENET - University of Puerto Rico, PR 376 196 146 150 RISQ-AS - Reseau dInformations Scientifiq 668 188 585 160 DNIC-AS-00668 - United States Department 18558 141 18 5 NETBLK-RCOEK - Riverside County Office of 81 115 455 35 NCREN - MCNC, US 21976 94 34 16 NJEDGE-NET - NJEDge.Net, Inc., US 237 83 542 49 MERIT-AS-14 - Merit Network Inc., US 3477 82 79 40 NOAA-NWAVE - National Oceanic and Atmosph 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 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 786 210 1684 192 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 1103 100 1759 85 SURFNET-NL SURFnet, The Netherlands, NL 8895 98 24 5 ISU Internet Services Unit ISU, SA 2614 87 26 67 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 64 630 59 FR-RENATER Reseau National de telecommuni 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 220 161 40 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 49 Red Universitaria Nacional, CL 3596 66 8 4 Universidad Autonoma Metropolitana, MX 271640 65 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 57 84 39 Fundacao Carlos Chagas Filho de Amparo a 19611 53 17 2 Associacao Antonio Vieira - Unisinos, BR 1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 21612 27 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 20191 26 16 1 Pontificia Universidad Catolica de Chile, 278 19 32 4 Universidad Nacional Autonoma de Mexico, 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 554 82 3 KENET-AS, KE 2018 374 318 69 TENET-1, ZA 2561 68 4 34 EUN, EG 8094 46 48 21 PUKNET, ZA 37215 45 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 37501 11 49 6 UOFS, ZA 327700 11 16 1 MoRENet, MZ 37182 10 8 1 TERNET, TZ 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 693 491 97 CENIC-2152 - CENIC, US 2907 606 2153 464 SINET-AS Research Organization of Informa 36914 554 82 3 KENET-AS, KE 7497 466 212 24 CSTNET-AS-AP Computer Network Information 2018 374 318 69 TENET-1, ZA 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 1659 228 1246 54 ERX-TANET-ASN1 Taiwan Academic Network TA 2920 226 44 49 LACOE - Los Angeles County Office of Educ 1916 220 161 40 Rede Nacional de Ensino e Pesquisa, BR 786 210 1684 192 JANET Jisc Services Limited, GB 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 554 551 KENET-AS, KE 7497 466 442 CSTNET-AS-AP Computer Network Information Cente 2018 374 305 TENET-1, ZA 5786 197 196 UPRENET - University of Puerto Rico, PR 1916 220 180 Rede Nacional de Ensino e Pesquisa, BR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 226 177 LACOE - Los Angeles County Office of Education, 1659 228 174 ERX-TANET-ASN1 Taiwan Academic Network TANet In 2907 606 142 SINET-AS Research Organization of Information a 18558 141 136 NETBLK-RCOEK - Riverside County Office of Educa 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 - University 64011 UNALLOCATED 130.215.0.0/16 10326 WPI - Worcester Polytec 401367 UNALLOCATED 216.186.25.0/24 10430 WA-K20 - Washington Sta Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP Adelaide Unive 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 /12:10 /13:18 /14:33 /15:114 /16:1945 /17:419 /18:469 /19:606 /20:832 /21:892 /22:1466 /23:1657 /24:10670 /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 530 554 KENET-AS, KE 8895 95 98 ISU Internet Services Unit ISU, SA 2152 84 693 CENIC-2152 - CENIC, US 31638 48 48 ASN-LEPIDA, IT 37215 39 45 MAREN, MW 200521 34 58 SEAP-AGE, ES 46115 32 35 LUTHER - Luther College, US 25977 30 44 HCCS - HOUSTON COMMUNITY COLLEGE SYSTEM, US 27609 29 45 USC-UNIVERSITY-HOSPITAL - USC-University Hospital, US 40326 29 33 ECKERD-COLLEGE - Eckerd College, US Complete listing at https://bgp.nsrc.org/REN/SingAREN/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:19 6:5 8:13 12:2 14:96 23:10 24:2 31:1 35:3 37:26 38:11 40:1 41:237 42:16 44:6 45:30 46:4 47:1 49:13 50:4 58:13 59:20 60:6 61:3 62:6 63:36 64:43 65:8 66:45 67:40 68:14 69:18 70:3 72:6 74:57 76:27 77:4 78:3 79:6 80:7 81:27 82:3 83:7 84:8 85:26 86:4 87:1 89:17 91:36 93:14 94:2 95:2 96:5 97:1 98:3 101:5 102:6 103:353 104:77 108:9 109:13 111:7 113:2 114:24 116:9 117:5 118:33 119:36 121:18 122:8 123:8 124:42 125:3 128:58 129:48 130:101 131:68 132:62 133:157 134:121 136:199 137:121 138:10 139:5 140:86 141:8 142:32 143:25 144:8 145:13 146:135 147:67 148:72 149:11 150:36 151:8 152:126 153:15 154:38 155:88 156:123 157:26 158:28 159:113 160:35 161:37 162:23 163:86 164:10 165:48 166:1 167:34 168:104 169:7 170:17 171:1 172:1 173:5 175:15 177:6 179:12 180:16 181:1 182:11 184:2 185:42 186:4 187:8 188:22 190:2 191:13 192:1435 193:307 194:127 195:97 196:150 197:340 198:578 199:258 200:304 201:5 202:522 203:361 204:419 205:183 206:201 207:350 208:41 209:155 210:242 211:15 212:135 213:4 214:8 216:94 217:22 218:21 219:7 220:16 222:4 223:17 End of report