IPv4 R&E Routing Table Report 22:05 GMT Sat 21 Jun, 2025 IPv4 BGP Table (R&E) as seen at CENIC. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/CENIC/ Analysis Summary ---------------- BGP routing table entries examined: 20096 Prefixes after maximum aggregation (per Origin AS): 11558 Deaggregation factor: 1.74 Unique aggregates announced (without unneeded subnets): 12870 Number of IPv4 prefixes with a valid ROA: 8730 Number of IPv4 prefixes with an invalid ROA: 10 Number of IPv4 prefixes with no ROA: 11356 Total ASes present in the Internet Routing Table: 2821 Prefixes per ASN: 7.12 Origin-only ASes present in the Internet Routing Table: 2455 Origin ASes announcing only one prefix: 1078 Transit ASes present in the Internet Routing Table: 366 Transit-only ASes present in the Internet Routing Table: 55 Paths with bogon ASNs present in the IPv4 Routing Table: 5 Average AS path length visible in the Internet Routing Table: 4.2 Max AS path length visible: 19 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 36 Number of instances of unregistered ASNs: 36 Number of 32-bit ASNs allocated by the RIRs: 46694 Number of 32-bit ASNs visible in the Routing Table: 714 Prefixes from 32-bit ASNs in the Routing Table: 1912 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: 3 Number of addresses announced to Internet: 270789120 Equivalent to 16 /8s, 35 /16s and 234 /24s Percentage of available address space announced: 7.3 Percentage of allocated address space announced: 7.3 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: 2477 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4844 Total APNIC prefixes after maximum aggregation: 2327 APNIC Deaggregation factor: 2.08 Prefixes being announced from the APNIC address blocks: 4915 Unique aggregates announced from the APNIC address blocks: 2735 APNIC Region origin ASes present in the Internet Routing Table: 605 APNIC Prefixes per ASN: 8.12 APNIC Region origin ASes announcing only one prefix: 255 APNIC Region transit ASes present in the Internet Routing Table: 52 Average APNIC Region AS path length visible: 4.7 Max APNIC Region AS path length visible: 14 Number of APNIC region 32-bit ASNs visible in the Routing Table: 245 Number of APNIC addresses announced to Internet: 47250176 Equivalent to 2 /8s, 208 /16s and 251 /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: 9161 Total ARIN prefixes after maximum aggregation: 5693 ARIN Deaggregation factor: 1.61 Prefixes being announced from the ARIN address blocks: 8799 Unique aggregates announced from the ARIN address blocks: 5952 ARIN Region origin ASes present in the Internet Routing Table: 1313 ARIN Prefixes per ASN: 6.70 ARIN Region origin ASes announcing only one prefix: 448 ARIN Region transit ASes present in the Internet Routing Table: 160 Average ARIN Region AS path length visible: 3.6 Max ARIN Region AS path length visible: 15 Number of ARIN region 32-bit ASNs visible in the Routing Table: 223 Number of ARIN addresses announced to Internet: 136079616 Equivalent to 8 /8s, 28 /16s and 105 /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: 3593 Total RIPE prefixes after maximum aggregation: 2860 RIPE Deaggregation factor: 1.26 Prefixes being announced from the RIPE address blocks: 3911 Unique aggregates announced from the RIPE address blocks: 3266 RIPE Region origin ASes present in the Internet Routing Table: 656 RIPE Prefixes per ASN: 5.96 RIPE Region origin ASes announcing only one prefix: 289 RIPE Region transit ASes present in the Internet Routing Table: 104 Average RIPE Region AS path length visible: 4.7 Max RIPE Region AS path length visible: 15 Number of RIPE region 32-bit ASNs visible in the Routing Table: 152 Number of RIPE addresses announced to Internet: 80182784 Equivalent to 4 /8s, 199 /16s and 126 /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: 1289 Total LACNIC prefixes after maximum aggregation: 492 LACNIC Deaggregation factor: 2.62 Prefixes being announced from the LACNIC address blocks: 1291 Unique aggregates announced from the LACNIC address blocks: 679 LACNIC Region origin ASes present in the Internet Routing Table: 133 LACNIC Prefixes per ASN: 9.71 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: 4.9 Max LACNIC Region AS path length visible: 13 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 60 Number of LACNIC addresses announced to Internet: 4604928 Equivalent to 0 /8s, 70 /16s and 68 /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: 1173 Total AfriNIC prefixes after maximum aggregation: 178 AfriNIC Deaggregation factor: 6.59 Prefixes being announced from the AfriNIC address blocks: 1177 Unique aggregates announced from the AfriNIC address blocks: 235 AfriNIC Region origin ASes present in the Internet Routing Table: 56 AfriNIC Prefixes per ASN: 21.02 AfriNIC Region origin ASes announcing only one prefix: 30 AfriNIC Region transit ASes present in the Internet Routing Table: 11 Average AfriNIC Region AS path length visible: 4.9 Max AfriNIC Region AS path length visible: 19 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 34 Number of AfriNIC addresses announced to Internet: 2669056 Equivalent to 0 /8s, 40 /16s and 186 /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 598 2170 464 SINET-AS Research Organization of Informa 7497 454 180 23 CSTNET-AS-AP Computer Network Information 1237 194 74 146 KREONET-AS-KR KISTI, KR 4538 193 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 174 282 117 AARNET-AS-AP Australian Academic and Rese 55824 148 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 1659 61 1466 35 ERX-TANET-ASN1 Taiwan Academic Network TA Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 8075 773 16022 652 MICROSOFT-CORP-MSN-AS-BLOCK, US 668 211 648 180 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 5786 200 16 1 UPRENET, PR 2920 176 34 7 LACOE, US 2152 147 491 96 CENIC-2152, US 18558 139 18 4 NETBLK-RCOEK, US 81 129 519 34 NCREN, US 270 117 328 81 AS270, US 23024 99 7 17 OCDE, US Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 786 194 1742 187 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Peering requests: peering@switch.c 8895 109 24 5 ISU Internet Services Unit ISU, SA 1103 98 1743 84 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 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 241 177 40 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 52 100 36 Fundacao Carlos Chagas Filho de Amparo a 61468 52 3 21 CEDIA, EC 19611 48 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/CENIC/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 2018 375 318 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 37661 9 6 3 NRaE1-AS, NG 36982 8 33 8 UCT, ZA Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 8075 773 16022 652 MICROSOFT-CORP-MSN-AS-BLOCK, US 2907 598 2170 464 SINET-AS Research Organization of Informa 36914 563 82 3 KENET-AS, KE 7497 454 180 23 CSTNET-AS-AP Computer Network Information 2018 375 318 69 TENET-1, ZA 680 284 1899 250 DFN Verein zur Foerderung eines Deutschen 1916 241 177 40 Rede Nacional de Ensino e Pesquisa, BR 668 211 648 180 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 5786 200 16 1 UPRENET, PR Complete listing at https://bgp.nsrc.org/REN/CENIC/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 563 560 KENET-AS, KE 7497 454 431 CSTNET-AS-AP Computer Network Information Cente 2018 375 306 TENET-1, ZA 1916 241 201 Rede Nacional de Ensino e Pesquisa, BR 5786 200 199 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE, US 18558 139 135 NETBLK-RCOEK, US 2907 598 134 SINET-AS Research Organization of Information a 55824 148 127 NKN-CORE-NW NKN Core Network, IN Complete listing at https://bgp.nsrc.org/REN/CENIC/data-CIDRnet List of Unregistered Origin ASNs (Global) ----------------------------------------- Bad AS Designation Net Originated Transit AS Transit AS Name 65208 PRIVATE 63.225.1.0/24 11570 AS11570, US 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 65208 PRIVATE 206.206.156.0/22 11570 AS11570, US 26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US Complete listing at https://bgp.nsrc.org/REN/CENIC/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 202.14.117.0/24 Origin: 17827 STOU-AS-TH Sukhothai Thammathirat Open U 202.14.117.0/24 Transit: 4621 UNINET-AS-AP UNINET-, TH 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/CENIC/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 /10:3 /11:7 /12:25 /13:32 /14:61 /15:154 /16:2206 /17:447 /18:489 /19:608 /20:879 /21:888 /22:1471 /23:1593 /24:11232 /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 8075 144 773 MICROSOFT-CORP-MSN-AS-BLOCK, US 8895 106 109 ISU Internet Services Unit ISU, SA 23024 38 99 OCDE, US 3267 35 80 NIKS, RU 28614 32 38 Fundacao Universidade Regional de Blumenau, BR 46115 32 35 LUTHER, US 200521 32 57 SEAP-AGE, ES 32440 31 54 LONI, US 37215 31 37 MAREN, MW Complete listing at https://bgp.nsrc.org/REN/CENIC/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 2:1 4:2 5:17 6:4 8:2 12:2 13:33 14:93 20:17 23:12 24:3 31:2 35:16 37:16 38:11 40:1 41:226 42:18 44:5 45:55 46:6 47:1 49:12 50:7 52:6 58:15 59:20 60:6 61:3 62:15 63:38 64:53 65:6 66:64 67:45 68:17 69:27 70:2 71:1 72:9 74:59 76:35 77:9 78:3 79:10 80:13 81:28 82:5 83:9 84:5 85:51 86:7 87:1 89:10 91:46 92:4 93:15 94:6 95:2 96:5 97:2 98:2 101:3 102:14 103:376 104:81 107:2 108:11 109:5 111:22 113:5 114:24 116:9 117:62 118:34 119:31 121:28 122:8 123:8 124:42 125:5 128:58 129:44 130:97 131:72 132:68 133:156 134:111 135:5 136:200 137:55 138:17 139:5 140:31 141:6 142:33 143:29 144:16 145:7 146:139 147:57 148:202 149:11 150:43 151:13 152:140 153:15 154:47 155:96 156:128 157:28 158:30 159:118 160:35 161:28 162:34 163:75 164:16 165:48 166:2 167:31 168:103 169:7 170:42 171:1 172:2 173:7 175:16 176:1 177:5 178:2 179:12 180:16 181:1 182:12 184:7 185:82 186:3 187:25 188:16 189:3 190:17 191:13 192:1553 193:295 194:139 195:81 196:149 197:345 198:479 199:309 200:304 201:39 202:604 203:456 204:387 205:141 206:209 207:223 208:82 209:130 210:210 211:3 212:154 213:9 214:10 216:102 217:25 218:23 219:7 220:16 222:4 223:17 End of report