IPv4 R&E Routing Table Report 20:00 GMT Sun 17 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: 19124 Prefixes after maximum aggregation (per Origin AS): 10554 Deaggregation factor: 1.81 Unique aggregates announced (without unneeded subnets): 11632 Number of IPv4 prefixes with a valid ROA: 7956 Number of IPv4 prefixes with an invalid ROA: 201 Number of IPv4 prefixes with no ROA: 10967 Total ASes present in the Internet Routing Table: 2697 Prefixes per ASN: 7.09 Origin-only ASes present in the Internet Routing Table: 2330 Origin ASes announcing only one prefix: 1039 Transit ASes present in the Internet Routing Table: 367 Transit-only ASes present in the Internet Routing Table: 61 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 4.9 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: 49790 Number of 32-bit ASNs visible in the Routing Table: 691 Prefixes from 32-bit ASNs in the Routing Table: 1949 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: 197138944 Equivalent to 11 /8s, 192 /16s and 26 /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: 2121 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4709 Total APNIC prefixes after maximum aggregation: 2331 APNIC Deaggregation factor: 2.02 Prefixes being announced from the APNIC address blocks: 4711 Unique aggregates announced from the APNIC address blocks: 2627 APNIC Region origin ASes present in the Internet Routing Table: 588 APNIC Prefixes per ASN: 8.01 APNIC Region origin ASes announcing only one prefix: 253 APNIC Region transit ASes present in the Internet Routing Table: 54 Average APNIC Region AS path length visible: 3.7 Max APNIC Region AS path length visible: 12 Number of APNIC region 32-bit ASNs visible in the Routing Table: 245 Number of APNIC addresses announced to Internet: 44912128 Equivalent to 2 /8s, 173 /16s and 78 /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: 8716 Total ARIN prefixes after maximum aggregation: 4885 ARIN Deaggregation factor: 1.78 Prefixes being announced from the ARIN address blocks: 8729 Unique aggregates announced from the ARIN address blocks: 5431 ARIN Region origin ASes present in the Internet Routing Table: 1290 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: 5.6 Max ARIN Region AS path length visible: 17 Number of ARIN region 32-bit ASNs visible in the Routing Table: 226 Number of ARIN addresses announced to Internet: 88559872 Equivalent to 5 /8s, 71 /16s and 81 /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: 3406 Total RIPE prefixes after maximum aggregation: 2720 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3394 Unique aggregates announced from the RIPE address blocks: 2764 RIPE Region origin ASes present in the Internet Routing Table: 599 RIPE Prefixes per ASN: 5.67 RIPE Region origin ASes announcing only one prefix: 268 RIPE Region transit ASes present in the Internet Routing Table: 103 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: 57338880 Equivalent to 3 /8s, 106 /16s and 236 /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: 1174 Total LACNIC prefixes after maximum aggregation: 460 LACNIC Deaggregation factor: 2.55 Prefixes being announced from the LACNIC address blocks: 1173 Unique aggregates announced from the LACNIC address blocks: 625 LACNIC Region origin ASes present in the Internet Routing Table: 117 LACNIC Prefixes per ASN: 10.03 LACNIC Region origin ASes announcing only one prefix: 46 LACNIC Region transit ASes present in the Internet Routing Table: 23 Average LACNIC Region AS path length visible: 6.2 Max LACNIC Region AS path length visible: 15 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 49 Number of LACNIC addresses announced to Internet: 3897600 Equivalent to 0 /8s, 59 /16s and 121 /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: 1116 Total AfriNIC prefixes after maximum aggregation: 155 AfriNIC Deaggregation factor: 7.20 Prefixes being announced from the AfriNIC address blocks: 1116 Unique aggregates announced from the AfriNIC address blocks: 184 AfriNIC Region origin ASes present in the Internet Routing Table: 39 AfriNIC Prefixes per ASN: 28.62 AfriNIC Region origin ASes announcing only one prefix: 18 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: 10 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 19 Number of AfriNIC addresses announced to Internet: 2430208 Equivalent to 0 /8s, 37 /16s and 21 /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 464 212 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 151 19 20 NKN-CORE-NW NKN Core Network, IN 6262 63 134 56 CSIRO Commonwealth Scientific and Industr 9317 50 16 1 ITISNET-AS INHA UNIVERSITY, KR 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 688 492 98 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 786 211 1699 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 88 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 219 161 40 Rede Nacional de Ensino e Pesquisa, BR 28391 161 10 72 Universidad Juarez Autonoma de Tabasco, M 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, 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 551 82 3 KENET-AS, KE 2018 374 318 69 TENET-1, ZA 8094 46 48 21 PUKNET, ZA 37215 45 8 1 MAREN, MW 327700 13 16 1 MoRENet, MZ 37501 11 49 6 UOFS, ZA 37182 10 8 1 TERNET, TZ 36982 8 33 8 UCT, ZA 37654 8 1 6 RwEdNet-AS, RW 30983 4 4 1 MARWAN-AS, MA 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 688 492 98 CENIC-2152 - CENIC, US 2907 606 2153 464 SINET-AS Research Organization of Informa 36914 551 82 3 KENET-AS, KE 7497 464 212 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 219 161 40 Rede Nacional de Ensino e Pesquisa, BR 786 211 1699 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 551 548 KENET-AS, KE 7497 464 440 CSTNET-AS-AP Computer Network Information Cente 2018 374 305 TENET-1, ZA 5786 197 196 UPRENET - University of Puerto Rico, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 1916 219 179 Rede Nacional de Ensino e Pesquisa, BR 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 /16:1946 /17:419 /18:470 /19:604 /20:835 /21:893 /22:1464 /23:1653 /24:10662 /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 527 551 KENET-AS, KE 8895 95 98 ISU Internet Services Unit ISU, SA 2152 84 688 CENIC-2152 - CENIC, US 31638 48 48 ASN-LEPIDA, IT 37215 39 45 MAREN, MW 200521 33 57 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 14:95 23:10 24:2 31:1 35:2 37:26 38:11 40:1 41:233 42:16 44:6 45:26 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 79:5 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 98:3 101:5 102:5 103:341 104:75 108:9 109:13 111:7 113:2 114:24 116:9 117:5 118:33 119:35 121:18 122:8 123:8 124:42 125:3 128:58 129:48 130:101 131:68 132:63 133:157 134:121 136:199 137:121 138:10 139:5 140:86 141:8 142:32 143:27 144:8 145:13 146:135 147:66 148:233 149:11 150:36 151:9 152:126 153:15 154:38 155:87 156:123 157:27 158:28 159:113 160:35 161:37 162:23 163:86 164:10 165:48 166:1 167:34 168:104 169:7 170:17 171:1 172:1 173:6 175:15 177:6 179:9 180:16 181:1 182:11 184:2 185:41 186:4 187:8 188:22 190:1 191:13 192:1430 193:261 194:128 195:51 196:150 197:342 198:577 199:258 200:303 201:6 202:462 203:377 204:415 205:183 206:205 207:351 208:40 209:155 210:241 211:15 212:135 213:4 214:7 216:94 217:22 218:21 219:7 220:16 222:4 223:17 End of report