IPv4 R&E Routing Table Report 22:05 GMT Tue 28 Oct, 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: 20077 Prefixes after maximum aggregation (per Origin AS): 11602 Deaggregation factor: 1.73 Unique aggregates announced (without unneeded subnets): 12980 Number of IPv4 prefixes with a valid ROA: 9186 Number of IPv4 prefixes with an invalid ROA: 12 Number of IPv4 prefixes with no ROA: 10879 Total ASes present in the Internet Routing Table: 2810 Prefixes per ASN: 7.14 Origin-only ASes present in the Internet Routing Table: 2443 Origin ASes announcing only one prefix: 1094 Transit ASes present in the Internet Routing Table: 367 Transit-only ASes present in the Internet Routing Table: 52 Paths with bogon ASNs present in the IPv4 Routing Table: 5 Average AS path length visible in the Internet Routing Table: 4.0 Max AS path length visible: 15 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 14 Number of instances of unregistered ASNs: 14 Number of 32-bit ASNs allocated by the RIRs: 47817 Number of 32-bit ASNs visible in the Routing Table: 722 Prefixes from 32-bit ASNs in the Routing Table: 1920 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: 7 Number of addresses announced to Internet: 269491712 Equivalent to 16 /8s, 16 /16s and 30 /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: 2404 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4845 Total APNIC prefixes after maximum aggregation: 2363 APNIC Deaggregation factor: 2.05 Prefixes being announced from the APNIC address blocks: 4932 Unique aggregates announced from the APNIC address blocks: 2780 APNIC Region origin ASes present in the Internet Routing Table: 603 APNIC Prefixes per ASN: 8.18 APNIC Region origin ASes announcing only one prefix: 252 APNIC Region transit ASes present in the Internet Routing Table: 52 Average APNIC Region AS path length visible: 4.1 Max APNIC Region AS path length visible: 14 Number of APNIC region 32-bit ASNs visible in the Routing Table: 247 Number of APNIC addresses announced to Internet: 46361856 Equivalent to 2 /8s, 195 /16s and 109 /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: 9214 Total ARIN prefixes after maximum aggregation: 5708 ARIN Deaggregation factor: 1.61 Prefixes being announced from the ARIN address blocks: 8787 Unique aggregates announced from the ARIN address blocks: 5974 ARIN Region origin ASes present in the Internet Routing Table: 1304 ARIN Prefixes per ASN: 6.74 ARIN Region origin ASes announcing only one prefix: 456 ARIN Region transit ASes present in the Internet Routing Table: 163 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: 222 Number of ARIN addresses announced to Internet: 135727360 Equivalent to 8 /8s, 23 /16s and 9 /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: 3607 Total RIPE prefixes after maximum aggregation: 2862 RIPE Deaggregation factor: 1.26 Prefixes being announced from the RIPE address blocks: 3947 Unique aggregates announced from the RIPE address blocks: 3322 RIPE Region origin ASes present in the Internet Routing Table: 660 RIPE Prefixes per ASN: 5.98 RIPE Region origin ASes announcing only one prefix: 299 RIPE Region transit ASes present in the Internet Routing Table: 105 Average RIPE Region AS path length visible: 4.7 Max RIPE Region AS path length visible: 14 Number of RIPE region 32-bit ASNs visible in the Routing Table: 159 Number of RIPE addresses announced to Internet: 80250880 Equivalent to 4 /8s, 200 /16s and 136 /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: 1230 Total LACNIC prefixes after maximum aggregation: 485 LACNIC Deaggregation factor: 2.54 Prefixes being announced from the LACNIC address blocks: 1233 Unique aggregates announced from the LACNIC address blocks: 662 LACNIC Region origin ASes present in the Internet Routing Table: 132 LACNIC Prefixes per ASN: 9.34 LACNIC Region origin ASes announcing only one prefix: 58 LACNIC Region transit ASes present in the Internet Routing Table: 25 Average LACNIC Region AS path length visible: 5.0 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: 4518656 Equivalent to 0 /8s, 68 /16s and 243 /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: 1167 Total AfriNIC prefixes after maximum aggregation: 178 AfriNIC Deaggregation factor: 6.56 Prefixes being announced from the AfriNIC address blocks: 1171 Unique aggregates announced from the AfriNIC address blocks: 235 AfriNIC Region origin ASes present in the Internet Routing Table: 55 AfriNIC Prefixes per ASN: 21.29 AfriNIC Region origin ASes announcing only one prefix: 29 AfriNIC Region transit ASes present in the Internet Routing Table: 9 Average AfriNIC Region AS path length visible: 3.3 Max AfriNIC Region AS path length visible: 10 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 34 Number of AfriNIC addresses announced to Internet: 2629376 Equivalent to 0 /8s, 40 /16s and 31 /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 600 2169 462 SINET-AS Research Organization of Informa 7497 452 180 23 CSTNET-AS-AP Computer Network Information 1237 198 72 153 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 167 281 113 AARNET-AS-AP Australian Academic and Rese 55824 151 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 4621 62 36 8 UNINET-AS-AP UNINET-, TH 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 855 16029 708 MICROSOFT-CORP-MSN-AS-BLOCK, US 668 202 651 171 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 5786 192 16 1 UPRENET, PR 2920 176 34 7 LACOE, US 2152 148 492 98 CENIC-2152, US 18558 137 18 4 NETBLK-RCOEK, US 81 118 471 35 NCREN, US 270 118 329 82 AS270, US 21976 90 34 16 NJEDGE-NET, 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 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 786 213 1739 190 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Switch, Swiss Academic and Researc 8895 106 24 5 ISU Internet Services Unit ISU, SA 1103 100 1759 85 SURFNET-NL SURFnet, The Netherlands, NL 2614 88 26 68 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 3267 80 29 69 NIKS, RU 1930 77 88 72 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 205 177 41 Rede Nacional de Ensino e Pesquisa, BR 28391 159 10 71 Universidad Juarez Autonoma de Tabasco, M 11340 111 25 50 Red Universitaria Nacional, CL 271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 56 84 39 Fundacao Carlos Chagas Filho de Amparo a 61468 51 3 20 CEDIA, EC 19611 50 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 558 82 3 KENET-AS, KE 2018 375 318 69 TENET-1, ZA 8094 47 48 18 PUKNET, ZA 37215 43 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 327700 12 16 1 MoRENet, MZ 37501 11 49 6 UOFS, ZA 37654 10 1 6 RwEdNet-AS, RW 36982 8 33 8 UCT, ZA 327947 5 4 1 KNUST-, GH 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 855 16029 708 MICROSOFT-CORP-MSN-AS-BLOCK, US 2907 600 2169 462 SINET-AS Research Organization of Informa 36914 558 82 3 KENET-AS, KE 7497 452 180 23 CSTNET-AS-AP Computer Network Information 2018 375 318 69 TENET-1, ZA 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 786 213 1739 190 JANET Jisc Services Limited, GB 1916 205 177 41 Rede Nacional de Ensino e Pesquisa, BR 668 202 651 171 DNIC-AS-00668, US 376 200 162 150 RISQ-AS, CA 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 558 555 KENET-AS, KE 7497 452 429 CSTNET-AS-AP Computer Network Information Cente 2018 375 306 TENET-1, ZA 5786 192 191 UPRENET, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 176 169 LACOE, US 1916 205 164 Rede Nacional de Ensino e Pesquisa, BR 2907 600 138 SINET-AS Research Organization of Information a 18558 137 133 NETBLK-RCOEK, US 55824 151 130 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 64011 UNALLOCATED 130.215.0.0/16 10326 WPI, US 396334 UNALLOCATED 205.143.136.0/21 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.136.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.137.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.138.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.139.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.140.0/24 5078 ONENET-AS-1, US 396334 UNALLOCATED 205.143.141.0/24 5078 ONENET-AS-1, US Complete listing at https://bgp.nsrc.org/REN/CENIC/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 162.212.34.0/24 Origin: 54048 CVIN, US 162.212.34.0/24 Transit: 2152 CENIC-2152, US 164.160.192.0/21 Origin: 37661 NRaE1-AS, NG 164.160.192.0/21 Transit: 37288 WACREN, SN 165.101.120.0/24 Origin: 150725 NUS-AS-AP National University of Singapo 165.101.120.0/24 Transit: 23855 SINGAREN-GIX-AS-AP Singapore Advanced Re 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 202.46.245.0/24 Origin: 147171 IDNIC-BRIN-AS-ID Badan Riset dan Inovasi 202.46.245.0/24 Transit: 64302 IDNIC-IDREN-AS-ID IDREN - Indonesia Rese 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 /12:24 /13:31 /14:61 /15:154 /16:2197 /17:446 /18:479 /19:611 /20:858 /21:905 /22:1488 /23:1598 /24:11214 /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 534 558 KENET-AS, KE 8075 166 855 MICROSOFT-CORP-MSN-AS-BLOCK, US 8895 103 106 ISU Internet Services Unit ISU, SA 31638 48 48 ASN-LEPIDA, IT 37215 37 43 MAREN, MW 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 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 5:20 6:4 8:2 12:2 13:35 14:94 20:19 23:11 24:3 31:2 35:11 37:28 38:11 40:2 41:231 42:18 44:6 45:53 46:5 47:1 49:13 50:4 52:6 58:14 59:20 60:6 61:3 62:16 63:38 64:52 65:6 66:65 67:46 68:17 69:28 70:4 71:1 72:9 74:61 76:27 77:10 78:3 79:10 80:10 81:28 82:6 83:7 84:5 85:48 86:8 87:1 89:18 91:44 92:4 93:14 94:8 95:2 96:5 97:2 98:2 101:3 102:16 103:368 104:80 107:2 108:11 109:8 111:8 113:6 114:22 115:1 116:9 117:62 118:34 119:30 121:12 122:8 123:8 124:42 125:5 128:60 129:42 130:97 131:67 132:65 133:158 134:118 135:6 136:193 137:66 138:17 139:5 140:32 141:5 142:36 143:27 144:66 145:22 146:139 147:33 148:202 149:11 150:42 151:10 152:129 153:16 154:40 155:97 156:127 157:27 158:28 159:119 160:36 161:47 162:29 163:79 164:16 165:53 166:2 167:31 168:103 169:6 170:39 171:1 172:1 173:6 175:8 176:1 177:5 178:2 179:12 180:16 181:1 182:11 184:6 185:80 186:4 187:24 188:24 190:17 191:13 192:1561 193:289 194:139 195:79 196:150 197:342 198:490 199:312 200:300 201:22 202:623 203:468 204:388 205:134 206:212 207:220 208:56 209:97 210:224 211:3 212:151 213:9 214:9 216:102 217:26 218:20 219:7 220:16 222:4 223:17 End of report