IPv4 R&E Routing Table Report 22:05 GMT Wed 18 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: 19962 Prefixes after maximum aggregation (per Origin AS): 11541 Deaggregation factor: 1.73 Unique aggregates announced (without unneeded subnets): 12848 Number of IPv4 prefixes with a valid ROA: 8618 Number of IPv4 prefixes with an invalid ROA: 10 Number of IPv4 prefixes with no ROA: 11334 Total ASes present in the Internet Routing Table: 2803 Prefixes per ASN: 7.12 Origin-only ASes present in the Internet Routing Table: 2446 Origin ASes announcing only one prefix: 1072 Transit ASes present in the Internet Routing Table: 357 Transit-only ASes present in the Internet Routing Table: 49 Paths with bogon ASNs present in the IPv4 Routing Table: 5 Average AS path length visible in the Internet Routing Table: 4.3 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: 46679 Number of 32-bit ASNs visible in the Routing Table: 710 Prefixes from 32-bit ASNs in the Routing Table: 1908 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: 270668544 Equivalent to 16 /8s, 34 /16s and 19 /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: 2381 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4851 Total APNIC prefixes after maximum aggregation: 2332 APNIC Deaggregation factor: 2.08 Prefixes being announced from the APNIC address blocks: 4922 Unique aggregates announced from the APNIC address blocks: 2739 APNIC Region origin ASes present in the Internet Routing Table: 605 APNIC Prefixes per ASN: 8.14 APNIC Region origin ASes announcing only one prefix: 254 APNIC Region transit ASes present in the Internet Routing Table: 53 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: 47252736 Equivalent to 2 /8s, 209 /16s and 5 /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: 9154 Total ARIN prefixes after maximum aggregation: 5696 ARIN Deaggregation factor: 1.61 Prefixes being announced from the ARIN address blocks: 8794 Unique aggregates announced from the ARIN address blocks: 5953 ARIN Region origin ASes present in the Internet Routing Table: 1307 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: 136024320 Equivalent to 8 /8s, 27 /16s and 145 /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: 3568 Total RIPE prefixes after maximum aggregation: 2842 RIPE Deaggregation factor: 1.26 Prefixes being announced from the RIPE address blocks: 3885 Unique aggregates announced from the RIPE address blocks: 3249 RIPE Region origin ASes present in the Internet Routing Table: 655 RIPE Prefixes per ASN: 5.93 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: 153 Number of RIPE addresses announced to Internet: 80175360 Equivalent to 4 /8s, 199 /16s and 97 /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: 1276 Total LACNIC prefixes after maximum aggregation: 483 LACNIC Deaggregation factor: 2.64 Prefixes being announced from the LACNIC address blocks: 1277 Unique aggregates announced from the LACNIC address blocks: 667 LACNIC Region origin ASes present in the Internet Routing Table: 127 LACNIC Prefixes per ASN: 10.06 LACNIC Region origin ASes announcing only one prefix: 52 LACNIC Region transit ASes present in the Internet Routing Table: 20 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: 55 Number of LACNIC addresses announced to Internet: 4532224 Equivalent to 0 /8s, 69 /16s and 40 /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: 1077 Total AfriNIC prefixes after maximum aggregation: 180 AfriNIC Deaggregation factor: 5.98 Prefixes being announced from the AfriNIC address blocks: 1081 Unique aggregates announced from the AfriNIC address blocks: 237 AfriNIC Region origin ASes present in the Internet Routing Table: 57 AfriNIC Prefixes per ASN: 18.96 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: 5.8 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: 2681344 Equivalent to 0 /8s, 40 /16s and 234 /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 174 282 117 AARNET-AS-AP Australian Academic and Rese 55824 147 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 772 16022 651 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 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 559 113 533 108 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 51 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 467 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 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 772 16022 651 MICROSOFT-CORP-MSN-AS-BLOCK, US 2907 598 2170 464 SINET-AS Research Organization of Informa 36914 467 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 668 211 648 180 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 467 464 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 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 147 126 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 /19:608 /20:877 /21:879 /22:1461 /23:1587 /24:11130 /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 454 467 KENET-AS, KE 8075 144 772 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 14:92 20:17 23:12 24:3 31:2 35:16 37:16 38:11 40:1 41:156 42:18 44:5 45:53 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 66:63 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 91:46 92:4 93:15 94:6 95:2 96:5 97:2 98:2 101:3 102:15 103:377 104:81 107:2 108:11 109:5 111:22 113:5 114:24 116:9 117:62 118:35 119:31 121:28 122:8 123:8 124:42 125:5 128:58 129:41 130:97 131:72 132:68 133:156 134:110 135:5 136:200 137:55 138:17 139:5 140:31 141:6 142:33 143:29 144:25 145:7 146:139 147:57 148:202 149:11 150:43 151:13 152:140 153:13 154:46 155:95 156:128 157:28 158:31 159:118 160:35 161:28 162:34 163:75 164:16 165:50 166:2 167:29 168:103 169:7 170:42 171:1 172:2 173:7 175:16 176:1 177:5 178:2 179:12 180:16 181:1 182:12 184:7 185:82 186:3 187:25 188:16 189:3 190:17 191:13 192:1540 193:295 194:140 195:80 196:149 197:334 198:477 199:309 200:301 201:38 202:604 203:456 204:384 205:141 206:209 207:223 208:82 209:130 210:210 211:3 212:154 213:9 214:10 216:102 217:25 218:23 219:7 220:16 222:4 223:17 End of report