IPv4 R&E Routing Table Report 20:00 GMT Mon 04 Aug, 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: 19290 Prefixes after maximum aggregation (per Origin AS): 10645 Deaggregation factor: 1.81 Unique aggregates announced (without unneeded subnets): 11723 Number of IPv4 prefixes with a valid ROA: 7910 Number of IPv4 prefixes with an invalid ROA: 1 Number of IPv4 prefixes with no ROA: 11379 Total ASes present in the Internet Routing Table: 2772 Prefixes per ASN: 6.96 Origin-only ASes present in the Internet Routing Table: 2401 Origin ASes announcing only one prefix: 1067 Transit ASes present in the Internet Routing Table: 371 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: 4.7 Max AS path length visible: 17 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 33 Number of instances of unregistered ASNs: 33 Number of 32-bit ASNs allocated by the RIRs: 47047 Number of 32-bit ASNs visible in the Routing Table: 691 Prefixes from 32-bit ASNs in the Routing Table: 1877 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: 199269376 Equivalent to 11 /8s, 224 /16s and 156 /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: 2278 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4823 Total APNIC prefixes after maximum aggregation: 2355 APNIC Deaggregation factor: 2.05 Prefixes being announced from the APNIC address blocks: 4823 Unique aggregates announced from the APNIC address blocks: 2676 APNIC Region origin ASes present in the Internet Routing Table: 608 APNIC Prefixes per ASN: 7.93 APNIC Region origin ASes announcing only one prefix: 256 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: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 249 Number of APNIC addresses announced to Internet: 45438208 Equivalent to 2 /8s, 181 /16s and 85 /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: 8392 Total ARIN prefixes after maximum aggregation: 4743 ARIN Deaggregation factor: 1.77 Prefixes being announced from the ARIN address blocks: 8440 Unique aggregates announced from the ARIN address blocks: 5240 ARIN Region origin ASes present in the Internet Routing Table: 1269 ARIN Prefixes per ASN: 6.65 ARIN Region origin ASes announcing only one prefix: 448 ARIN Region transit ASes present in the Internet Routing Table: 159 Average ARIN Region AS path length visible: 5.4 Max ARIN Region AS path length visible: 17 Number of ARIN region 32-bit ASNs visible in the Routing Table: 215 Number of ARIN addresses announced to Internet: 89359872 Equivalent to 5 /8s, 83 /16s and 134 /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: 3643 Total RIPE prefixes after maximum aggregation: 2904 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3627 Unique aggregates announced from the RIPE address blocks: 2948 RIPE Region origin ASes present in the Internet Routing Table: 665 RIPE Prefixes per ASN: 5.45 RIPE Region origin ASes announcing only one prefix: 295 RIPE Region transit ASes present in the Internet Routing Table: 108 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: 157 Number of RIPE addresses announced to Internet: 58059264 Equivalent to 3 /8s, 117 /16s and 234 /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: 1264 Total LACNIC prefixes after maximum aggregation: 490 LACNIC Deaggregation factor: 2.58 Prefixes being announced from the LACNIC address blocks: 1264 Unique aggregates announced from the LACNIC address blocks: 658 LACNIC Region origin ASes present in the Internet Routing Table: 132 LACNIC Prefixes per ASN: 9.58 LACNIC Region origin ASes announcing only one prefix: 56 LACNIC Region transit ASes present in the Internet Routing Table: 25 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: 60 Number of LACNIC addresses announced to Internet: 4067840 Equivalent to 0 /8s, 62 /16s and 18 /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: 1135 Total AfriNIC prefixes after maximum aggregation: 148 AfriNIC Deaggregation factor: 7.67 Prefixes being announced from the AfriNIC address blocks: 1134 Unique aggregates announced from the AfriNIC address blocks: 199 AfriNIC Region origin ASes present in the Internet Routing Table: 29 AfriNIC Prefixes per ASN: 39.10 AfriNIC Region origin ASes announcing only one prefix: 12 AfriNIC Region transit ASes present in the Internet Routing Table: 8 Average AfriNIC Region AS path length visible: 5.2 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 10 Number of AfriNIC addresses announced to Internet: 2341888 Equivalent to 0 /8s, 35 /16s and 188 /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 601 2169 462 SINET-AS Research Organization of Informa 7497 453 180 23 CSTNET-AS-AP Computer Network Information 1237 194 74 146 KREONET-AS-KR KISTI, KR 4538 192 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 170 281 115 AARNET-AS-AP Australian Academic and Rese 55824 149 19 21 NKN-CORE-NW NKN Core Network, IN 4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha 4621 67 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 583 492 99 CENIC-2152, US 2920 232 44 49 LACOE, US 668 202 648 170 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 5786 199 16 1 UPRENET, PR 18558 140 18 5 NETBLK-RCOEK, US 81 127 471 35 NCREN, US 23024 99 7 17 OCDE, US 21976 90 34 16 NJEDGE-NET, US 237 85 543 51 MERIT-AS-14, 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 680 287 1899 253 DFN Verein zur Foerderung eines Deutschen 786 193 1742 187 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Switch, Swiss Academic and Researc 8895 109 24 5 ISU Internet Services Unit ISU, SA 1103 99 1759 85 SURFNET-NL SURFnet, The Netherlands, NL 2614 92 26 69 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 3267 80 29 69 NIKS, RU 1930 78 88 73 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 240 177 41 Rede Nacional de Ensino e Pesquisa, BR 28391 159 10 71 Universidad Juarez Autonoma de Tabasco, M 11340 110 25 52 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 53 100 36 Fundacao Carlos Chagas Filho de Amparo a 61468 51 3 20 CEDIA, EC 19611 48 17 2 Associacao Antonio Vieira - Unisinos, BR 28614 38 2 2 Fundacao Universidade Regional de Blumena 3596 37 8 4 Universidad Autonoma Metropolitana, MX 1251 36 31 27 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 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 574 82 3 KENET-AS, KE 2018 374 318 69 TENET-1, ZA 8094 47 48 18 PUKNET, ZA 37215 37 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 37501 11 49 6 UOFS, ZA 327700 11 16 1 MoRENet, MZ 37654 10 1 6 RwEdNet-AS, RW 36982 8 33 8 UCT, ZA 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 2907 601 2169 462 SINET-AS Research Organization of Informa 2152 583 492 99 CENIC-2152, US 36914 574 82 3 KENET-AS, KE 7497 453 180 23 CSTNET-AS-AP Computer Network Information 2018 374 318 69 TENET-1, ZA 680 287 1899 253 DFN Verein zur Foerderung eines Deutschen 1916 240 177 41 Rede Nacional de Ensino e Pesquisa, BR 2920 232 44 49 LACOE, US 668 202 648 170 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 574 571 KENET-AS, KE 2152 583 484 CENIC-2152, US 7497 453 430 CSTNET-AS-AP Computer Network Information Cente 2018 374 305 TENET-1, ZA 1916 240 199 Rede Nacional de Ensino e Pesquisa, BR 5786 199 198 UPRENET, PR 2920 232 183 LACOE, US 58647 182 180 KAGAWAU-AS Kagawa University, JP 18558 140 135 NETBLK-RCOEK, US 55824 149 128 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 26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US 26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US 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 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 /16:1967 /17:417 /18:462 /19:593 /20:849 /21:864 /22:1440 /23:1613 /24:10905 /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 550 574 KENET-AS, KE 8895 106 109 ISU Internet Services Unit ISU, SA 2152 66 583 CENIC-2152, US 23024 38 99 OCDE, US 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 37215 31 37 MAREN, MW 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 5:16 6:4 8:2 12:2 14:93 23:9 24:3 31:1 35:4 37:14 38:11 40:1 41:224 42:18 44:5 45:43 46:5 47:1 49:12 50:2 52:1 58:14 59:20 60:6 61:3 62:8 63:32 64:43 65:5 66:43 67:40 68:13 69:17 70:2 71:1 72:8 74:54 76:25 77:9 78:3 79:9 80:13 81:27 82:6 83:8 84:8 85:51 86:6 87:1 89:9 91:40 92:2 93:15 94:2 95:2 96:5 97:1 98:2 101:3 102:6 103:359 104:75 108:8 109:7 111:10 113:1 114:21 116:8 117:61 118:34 119:31 121:20 122:8 123:8 124:42 125:5 128:59 129:46 130:97 131:66 132:68 133:156 134:113 136:200 137:106 138:11 139:5 140:31 141:4 142:26 143:26 144:30 145:4 146:136 147:54 148:200 149:10 150:37 151:10 152:136 153:15 154:40 155:85 156:129 157:25 158:27 159:117 160:35 161:17 162:22 163:73 164:10 165:43 167:28 168:96 169:6 170:19 171:1 172:1 173:5 175:16 177:5 179:9 180:16 181:1 182:12 184:2 185:51 186:4 187:23 188:16 190:17 191:13 192:1425 193:295 194:145 195:82 196:145 197:358 198:542 199:275 200:304 201:22 202:636 203:434 204:400 205:177 206:204 207:318 208:64 209:168 210:218 211:4 212:149 213:4 214:10 216:95 217:22 218:23 219:7 220:16 222:4 223:16 End of report