IPv4 R&E Routing Table Report 22:05 GMT Mon 16 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: 20044 Prefixes after maximum aggregation (per Origin AS): 11533 Deaggregation factor: 1.74 Unique aggregates announced (without unneeded subnets): 12832 Number of IPv4 prefixes with a valid ROA: 8721 Number of IPv4 prefixes with an invalid ROA: 10 Number of IPv4 prefixes with no ROA: 11313 Total ASes present in the Internet Routing Table: 2800 Prefixes per ASN: 7.16 Origin-only ASes present in the Internet Routing Table: 2444 Origin ASes announcing only one prefix: 1072 Transit ASes present in the Internet Routing Table: 356 Transit-only ASes present in the Internet Routing Table: 50 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: 46662 Number of 32-bit ASNs visible in the Routing Table: 706 Prefixes from 32-bit ASNs in the Routing Table: 1899 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: 270617344 Equivalent to 16 /8s, 33 /16s and 75 /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: 2456 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4835 Total APNIC prefixes after maximum aggregation: 2324 APNIC Deaggregation factor: 2.08 Prefixes being announced from the APNIC address blocks: 4906 Unique aggregates announced from the APNIC address blocks: 2725 APNIC Region origin ASes present in the Internet Routing Table: 605 APNIC Prefixes per ASN: 8.11 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: 47247872 Equivalent to 2 /8s, 208 /16s and 242 /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: 9140 Total ARIN prefixes after maximum aggregation: 5680 ARIN Deaggregation factor: 1.61 Prefixes being announced from the ARIN address blocks: 8781 Unique aggregates announced from the ARIN address blocks: 5941 ARIN Region origin ASes present in the Internet Routing Table: 1304 ARIN Prefixes per ASN: 6.73 ARIN Region origin ASes announcing only one prefix: 447 ARIN Region transit ASes present in the Internet Routing Table: 157 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: 135965952 Equivalent to 8 /8s, 26 /16s and 173 /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: 3590 Total RIPE prefixes after maximum aggregation: 2862 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3906 Unique aggregates announced from the RIPE address blocks: 3265 RIPE Region origin ASes present in the Internet Routing Table: 658 RIPE Prefixes per ASN: 5.94 RIPE Region origin ASes announcing only one prefix: 291 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: 153 Number of RIPE addresses announced to Internet: 80189184 Equivalent to 4 /8s, 199 /16s and 151 /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: 1275 Total LACNIC prefixes after maximum aggregation: 481 LACNIC Deaggregation factor: 2.65 Prefixes being announced from the LACNIC address blocks: 1276 Unique aggregates announced from the LACNIC address blocks: 666 LACNIC Region origin ASes present in the Internet Routing Table: 125 LACNIC Prefixes per ASN: 10.21 LACNIC Region origin ASes announcing only one prefix: 50 LACNIC Region transit ASes present in the Internet Routing Table: 21 Average LACNIC Region AS path length visible: 4.9 Max LACNIC Region AS path length visible: 10 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 53 Number of LACNIC addresses announced to Internet: 4531712 Equivalent to 0 /8s, 69 /16s and 38 /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: 1168 Total AfriNIC prefixes after maximum aggregation: 178 AfriNIC Deaggregation factor: 6.56 Prefixes being announced from the AfriNIC address blocks: 1172 Unique aggregates announced from the AfriNIC address blocks: 232 AfriNIC Region origin ASes present in the Internet Routing Table: 55 AfriNIC Prefixes per ASN: 21.31 AfriNIC Region origin ASes announcing only one prefix: 29 AfriNIC Region transit ASes present in the Internet Routing Table: 10 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: 32 Number of AfriNIC addresses announced to Internet: 2680064 Equivalent to 0 /8s, 40 /16s and 229 /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 456 180 24 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 170 281 114 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 771 16022 650 MICROSOFT-CORP-MSN-AS-BLOCK, US 668 206 646 176 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 5786 199 16 1 UPRENET, PR 2920 176 34 7 LACOE, US 2152 148 507 97 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 1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog 3267 79 29 69 NIKS, RU 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 50 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 564 82 3 KENET-AS, KE 2018 374 318 69 TENET-1, ZA 8094 47 48 18 PUKNET, ZA 37215 36 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 37501 11 49 6 UOFS, ZA 37654 10 1 6 RwEdNet-AS, RW 327700 10 16 1 MoRENet, MZ 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 771 16022 650 MICROSOFT-CORP-MSN-AS-BLOCK, US 2907 598 2170 464 SINET-AS Research Organization of Informa 36914 564 82 3 KENET-AS, KE 7497 456 180 24 CSTNET-AS-AP Computer Network Information 2018 374 318 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 668 206 646 176 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 5786 199 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 564 561 KENET-AS, KE 7497 456 432 CSTNET-AS-AP Computer Network Information Cente 2018 374 305 TENET-1, ZA 1916 241 201 Rede Nacional de Ensino e Pesquisa, BR 5786 199 198 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 /16:2205 /17:446 /18:486 /19:609 /20:875 /21:877 /22:1476 /23:1592 /24:11195 /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 540 564 KENET-AS, KE 8075 143 771 MICROSOFT-CORP-MSN-AS-BLOCK, US 8895 106 109 ISU Internet Services Unit ISU, SA 23024 38 99 OCDE, US 3267 35 79 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 25977 30 44 HCCS, US 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 37:11 38:11 40:1 41:223 42:18 44:5 45:49 46:6 47:1 49:12 50:7 52:6 58:15 59:20 60:6 61:3 62:15 63:38 64:52 65:6 66:63 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 91:47 92:4 93:15 94:6 95:2 96:5 97:2 98:2 101:3 102:10 103:372 104:81 107:2 108:11 109:5 111:22 113:5 114:24 116:9 117:62 118:35 119:31 121:28 122:8 123:8 124:42 125:5 128:58 129:44 130:98 131:72 132:68 133:156 134:110 135:5 136:200 137:55 138:17 139:4 140:31 141:6 142:33 143:29 144:25 145:7 146:139 147:57 148:202 149:11 150:43 151:13 152:140 153:15 154:46 155:92 156:128 157:28 158:31 159:118 160:35 161:30 162:34 163:75 164:16 165:48 166:2 167:29 168:103 169:7 170:42 171:1 172:2 173:7 175:16 176:1 177:5 178:2 179:12 180:16 181:1 182:12 184:7 185:80 186:3 187:25 188:16 189:3 190:16 191:13 192:1551 193:295 194:140 195:80 196:149 197:347 198:475 199:307 200:300 201:38 202:604 203:455 204:385 205:141 206:209 207:223 208:81 209:129 210:210 211:3 212:154 213:9 214:10 216:102 217:25 218:23 219:7 220:16 222:4 223:17 End of report