IPv4 R&E Routing Table Report 20:00 GMT Sun 22 Mar, 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: 19461 Prefixes after maximum aggregation (per Origin AS): 10693 Deaggregation factor: 1.82 Unique aggregates announced (without unneeded subnets): 11804 Number of IPv4 prefixes with a valid ROA: 8364 Number of IPv4 prefixes with an invalid ROA: 15 Number of IPv4 prefixes with no ROA: 11082 Total ASes present in the Internet Routing Table: 2762 Prefixes per ASN: 7.05 Origin-only ASes present in the Internet Routing Table: 2384 Origin ASes announcing only one prefix: 1066 Transit ASes present in the Internet Routing Table: 378 Transit-only ASes present in the Internet Routing Table: 67 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: 49057 Number of 32-bit ASNs visible in the Routing Table: 710 Prefixes from 32-bit ASNs in the Routing Table: 1971 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: 198389760 Equivalent to 11 /8s, 211 /16s and 48 /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: 2180 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4804 Total APNIC prefixes after maximum aggregation: 2369 APNIC Deaggregation factor: 2.03 Prefixes being announced from the APNIC address blocks: 4806 Unique aggregates announced from the APNIC address blocks: 2615 APNIC Region origin ASes present in the Internet Routing Table: 615 APNIC Prefixes per ASN: 7.81 APNIC Region origin ASes announcing only one prefix: 265 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: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 255 Number of APNIC addresses announced to Internet: 45479936 Equivalent to 2 /8s, 181 /16s and 248 /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: 8835 Total ARIN prefixes after maximum aggregation: 4923 ARIN Deaggregation factor: 1.79 Prefixes being announced from the ARIN address blocks: 8847 Unique aggregates announced from the ARIN address blocks: 5491 ARIN Region origin ASes present in the Internet Routing Table: 1300 ARIN Prefixes per ASN: 6.81 ARIN Region origin ASes announcing only one prefix: 453 ARIN Region transit ASes present in the Internet Routing Table: 166 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: 222 Number of ARIN addresses announced to Internet: 88989184 Equivalent to 5 /8s, 77 /16s and 222 /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: 3405 Total RIPE prefixes after maximum aggregation: 2717 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3393 Unique aggregates announced from the RIPE address blocks: 2764 RIPE Region origin ASes present in the Internet Routing Table: 603 RIPE Prefixes per ASN: 5.63 RIPE Region origin ASes announcing only one prefix: 271 RIPE Region transit ASes present in the Internet Routing Table: 104 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: 153 Number of RIPE addresses announced to Internet: 57525248 Equivalent to 3 /8s, 109 /16s and 196 /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: 1212 Total LACNIC prefixes after maximum aggregation: 480 LACNIC Deaggregation factor: 2.52 Prefixes being announced from the LACNIC address blocks: 1212 Unique aggregates announced from the LACNIC address blocks: 652 LACNIC Region origin ASes present in the Internet Routing Table: 131 LACNIC Prefixes per ASN: 9.25 LACNIC Region origin ASes announcing only one prefix: 57 LACNIC Region transit ASes present in the Internet Routing Table: 26 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: 3929600 Equivalent to 0 /8s, 59 /16s and 246 /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: 1202 Total AfriNIC prefixes after maximum aggregation: 201 AfriNIC Deaggregation factor: 5.98 Prefixes being announced from the AfriNIC address blocks: 1201 Unique aggregates announced from the AfriNIC address blocks: 280 AfriNIC Region origin ASes present in the Internet Routing Table: 43 AfriNIC Prefixes per ASN: 27.93 AfriNIC Region origin ASes announcing only one prefix: 20 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: 10 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 21 Number of AfriNIC addresses announced to Internet: 2463488 Equivalent to 0 /8s, 37 /16s and 151 /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 454 180 23 CSTNET-AS-AP Computer Network Information 1237 199 72 154 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 165 281 112 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 1659 61 1466 35 ERX-TANET-ASN1 Taiwan Academic Network TA 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 681 492 98 CENIC-2152 - CENIC, US 2920 226 44 49 LACOE - Los Angeles County Office of Educ 376 197 162 151 RISQ-AS - Reseau dInformations Scientifiq 5786 191 16 1 UPRENET - University of Puerto Rico, PR 668 182 555 155 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 786 209 1731 188 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 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 204 161 40 Rede Nacional de Ensino e Pesquisa, BR 28391 161 10 72 Universidad Juarez Autonoma de Tabasco, M 11340 106 24 48 Red Universitaria Nacional, CL 3596 66 8 4 Universidad Autonoma Metropolitana, MX 271640 66 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 61468 52 3 21 CEDIA, EC 1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 21612 27 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 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 542 82 3 KENET-AS, KE 2018 375 318 69 TENET-1, ZA 2561 68 4 34 EUN, EG 8094 46 48 21 PUKNET, ZA 37215 44 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 37654 9 1 5 RwEdNet-AS, RW 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 681 492 98 CENIC-2152 - CENIC, US 2907 606 2153 464 SINET-AS Research Organization of Informa 36914 542 82 3 KENET-AS, KE 7497 454 180 23 CSTNET-AS-AP Computer Network Information 2018 375 318 69 TENET-1, ZA 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 2920 226 44 49 LACOE - Los Angeles County Office of Educ 786 209 1731 188 JANET Jisc Services Limited, GB 1916 204 161 40 Rede Nacional de Ensino e Pesquisa, BR 1237 199 72 154 KREONET-AS-KR KISTI, KR 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 542 539 KENET-AS, KE 7497 454 431 CSTNET-AS-AP Computer Network Information Cente 2018 375 306 TENET-1, ZA 5786 191 190 UPRENET - University of Puerto Rico, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 226 177 LACOE - Los Angeles County Office of Education, 1916 204 164 Rede Nacional de Ensino e Pesquisa, BR 2907 606 142 SINET-AS Research Organization of Information a 18558 141 136 NETBLK-RCOEK - Riverside County Office of Educa 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 - 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 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 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 /12:11 /13:18 /14:33 /15:113 /16:1956 /17:420 /18:459 /19:602 /20:842 /21:898 /22:1466 /23:1643 /24:10997 /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 518 542 KENET-AS, KE 8895 100 103 ISU Internet Services Unit ISU, SA 2152 78 681 CENIC-2152 - CENIC, US 31638 48 48 ASN-LEPIDA, IT 37215 38 44 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 5:18 6:5 8:13 12:2 14:95 23:11 24:2 31:1 35:3 37:26 38:12 40:1 41:232 42:17 44:6 45:38 46:4 47:1 49:13 50:5 58:14 59:20 60:6 61:3 62:6 63:32 64:45 65:6 66:62 67:42 68:13 69:17 70:3 72:6 74:56 76:36 77:4 78:3 79:5 80:7 81:27 82:3 83:6 84:8 85:26 86:4 87:1 89:17 91:38 93:14 94:2 95:2 96:5 97:1 98:2 101:5 102:6 103:361 104:76 108:8 109:10 111:7 113:2 114:24 116:9 117:5 118:33 119:35 121:17 122:8 123:8 124:42 125:5 128:58 129:49 130:103 131:65 132:64 133:157 134:120 136:194 137:121 138:10 139:5 140:34 141:4 142:31 143:27 144:8 145:4 146:132 147:67 148:234 149:11 150:36 151:9 152:126 153:15 154:40 155:87 156:123 157:27 158:28 159:112 160:35 161:34 162:24 163:76 164:11 165:53 166:1 167:35 168:104 169:7 170:18 171:1 172:1 173:5 175:15 177:6 179:12 180:16 181:1 182:11 184:2 185:45 186:4 187:8 188:22 190:17 191:13 192:1454 193:312 194:120 195:97 196:149 197:332 198:588 199:282 200:296 201:7 202:603 203:438 204:417 205:184 206:203 207:349 208:39 209:160 210:231 211:15 212:139 213:4 214:8 216:95 217:22 218:21 219:7 220:16 222:4 223:17 End of report