IPv4 R&E Routing Table Report 21:00 GMT Mon 06 Oct, 2025 IPv4 BGP Table (R&E) as seen at AARNET (Seattle). Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/AARNET-Seattle/ Analysis Summary ---------------- BGP routing table entries examined: 20468 Prefixes after maximum aggregation (per Origin AS): 10618 Deaggregation factor: 1.93 Unique aggregates announced (without unneeded subnets): 11724 Number of IPv4 prefixes with a valid ROA: 7892 Number of IPv4 prefixes with an invalid ROA: 1300 Number of IPv4 prefixes with no ROA: 11276 Total ASes present in the Internet Routing Table: 2735 Prefixes per ASN: 7.48 Origin-only ASes present in the Internet Routing Table: 2369 Origin ASes announcing only one prefix: 1047 Transit ASes present in the Internet Routing Table: 366 Transit-only ASes present in the Internet Routing Table: 60 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 3.6 Max AS path length visible: 15 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 1 Number of instances of unregistered ASNs: 1 Number of 32-bit ASNs allocated by the RIRs: 47653 Number of 32-bit ASNs visible in the Routing Table: 663 Prefixes from 32-bit ASNs in the Routing Table: 1817 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: 4 Number of addresses announced to Internet: 198908068 Equivalent to 11 /8s, 219 /16s and 24 /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: 2624 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 5877 Total APNIC prefixes after maximum aggregation: 2252 APNIC Deaggregation factor: 2.61 Prefixes being announced from the APNIC address blocks: 5874 Unique aggregates announced from the APNIC address blocks: 2538 APNIC Region origin ASes present in the Internet Routing Table: 536 APNIC Prefixes per ASN: 10.96 APNIC Region origin ASes announcing only one prefix: 201 APNIC Region transit ASes present in the Internet Routing Table: 48 Average APNIC Region AS path length visible: 3.0 Max APNIC Region AS path length visible: 14 Number of APNIC region 32-bit ASNs visible in the Routing Table: 188 Number of APNIC addresses announced to Internet: 44573844 Equivalent to 2 /8s, 168 /16s and 36 /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: 8575 Total ARIN prefixes after maximum aggregation: 4820 ARIN Deaggregation factor: 1.78 Prefixes being announced from the ARIN address blocks: 8588 Unique aggregates announced from the ARIN address blocks: 5351 ARIN Region origin ASes present in the Internet Routing Table: 1289 ARIN Prefixes per ASN: 6.66 ARIN Region origin ASes announcing only one prefix: 460 ARIN Region transit ASes present in the Internet Routing Table: 158 Average ARIN Region AS path length visible: 3.9 Max ARIN Region AS path length visible: 15 Number of ARIN region 32-bit ASNs visible in the Routing Table: 221 Number of ARIN addresses announced to Internet: 89643520 Equivalent to 5 /8s, 87 /16s and 218 /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: 3618 Total RIPE prefixes after maximum aggregation: 2890 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3606 Unique aggregates announced from the RIPE address blocks: 2949 RIPE Region origin ASes present in the Internet Routing Table: 667 RIPE Prefixes per ASN: 5.41 RIPE Region origin ASes announcing only one prefix: 302 RIPE Region transit ASes present in the Internet Routing Table: 107 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: 163 Number of RIPE addresses announced to Internet: 58151952 Equivalent to 3 /8s, 119 /16s and 84 /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: 1223 Total LACNIC prefixes after maximum aggregation: 480 LACNIC Deaggregation factor: 2.55 Prefixes being announced from the LACNIC address blocks: 1223 Unique aggregates announced from the LACNIC address blocks: 655 LACNIC Region origin ASes present in the Internet Routing Table: 129 LACNIC Prefixes per ASN: 9.48 LACNIC Region origin ASes announcing only one prefix: 55 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: 14 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 57 Number of LACNIC addresses announced to Internet: 4057344 Equivalent to 0 /8s, 61 /16s and 233 /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: 1174 Total AfriNIC prefixes after maximum aggregation: 175 AfriNIC Deaggregation factor: 6.71 Prefixes being announced from the AfriNIC address blocks: 1173 Unique aggregates announced from the AfriNIC address blocks: 227 AfriNIC Region origin ASes present in the Internet Routing Table: 53 AfriNIC Prefixes per ASN: 22.13 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: 2478592 Equivalent to 0 /8s, 37 /16s and 210 /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 7575 1440 281 117 AARNET-AS-AP Australian Academic and Rese 2907 600 2169 462 SINET-AS Research Organization of Informa 7497 451 180 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 55824 79 9 32 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/AARNET-Seattle/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 2152 648 492 99 CENIC-2152, US 2920 230 44 49 LACOE, US 376 200 162 150 RISQ-AS, CA 668 198 603 166 DNIC-AS-00668, US 5786 197 16 1 UPRENET, PR 18558 139 18 5 NETBLK-RCOEK, US 81 127 471 35 NCREN, US 21976 90 34 16 NJEDGE-NET, US 237 83 542 49 MERIT-AS-14, US 1736 79 16 1 MU-AS, US Complete listing at https://bgp.nsrc.org/REN/AARNET-Seattle/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 786 188 1742 184 JANET Jisc Services Limited, GB 559 114 533 104 SWITCH Switch, Swiss Academic and Researc 8895 108 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/AARNET-Seattle/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 206 178 42 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 53 100 36 Fundacao Carlos Chagas Filho de Amparo a 61468 52 3 21 CEDIA, EC 19611 49 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/AARNET-Seattle/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 570 82 3 KENET-AS, KE 2018 376 318 69 TENET-1, ZA 8094 47 48 18 PUKNET, ZA 37215 42 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 6 4 1 KNUST-, GH Complete listing at https://bgp.nsrc.org/REN/AARNET-Seattle/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 7575 1440 281 117 AARNET-AS-AP Australian Academic and Rese 2152 648 492 99 CENIC-2152, US 2907 600 2169 462 SINET-AS Research Organization of Informa 36914 570 82 3 KENET-AS, KE 7497 451 180 23 CSTNET-AS-AP Computer Network Information 2018 376 318 69 TENET-1, ZA 680 283 1883 250 DFN Verein zur Foerderung eines Deutschen 2920 230 44 49 LACOE, US 1916 206 178 42 Rede Nacional de Ensino e Pesquisa, BR 376 200 162 150 RISQ-AS, CA Complete listing at https://bgp.nsrc.org/REN/AARNET-Seattle/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 570 567 KENET-AS, KE 2152 648 549 CENIC-2152, US 7497 451 428 CSTNET-AS-AP Computer Network Information Cente 2018 376 307 TENET-1, ZA 5786 197 196 UPRENET, PR 2920 230 181 LACOE, US 58647 182 180 KAGAWAU-AS Kagawa University, JP 1916 206 164 Rede Nacional de Ensino e Pesquisa, BR 2907 600 138 SINET-AS Research Organization of Information a 18558 139 134 NETBLK-RCOEK, US Complete listing at https://bgp.nsrc.org/REN/AARNET-Seattle/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 Complete listing at https://bgp.nsrc.org/REN/AARNET-Seattle/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 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 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/AARNET-Seattle/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 /12:10 /13:19 /14:33 /15:115 /16:1973 /17:420 /18:457 /19:583 /20:847 /21:861 /22:1449 /23:1592 /24:10754 /25:31 /26:57 /27:83 /28:117 /29:180 /30:430 /31:388 /32:66 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 546 570 KENET-AS, KE 7575 319 1440 AARNET-AS-AP Australian Academic and Research Network AARNet, AU 8895 105 108 ISU Internet Services Unit ISU, SA 2152 73 648 CENIC-2152, US 31638 48 48 ASN-LEPIDA, IT 37215 36 42 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 Complete listing at https://bgp.nsrc.org/REN/AARNET-Seattle/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:1 5:18 6:4 8:2 12:2 14:68 23:9 24:3 31:1 35:4 37:26 38:11 40:1 41:229 42:18 44:6 45:41 46:4 47:1 49:8 50:4 52:1 58:14 59:20 60:6 61:3 62:6 63:37 64:43 65:6 66:58 67:42 68:13 69:17 70:3 71:1 72:8 74:53 76:24 77:9 78:3 79:9 80:10 81:27 82:6 83:6 84:6 85:48 86:7 87:1 89:16 91:39 92:2 93:14 94:2 95:2 96:5 97:1 98:2 101:3 102:13 103:280 104:76 107:2 108:8 109:8 111:7 113:1 114:21 116:8 117:61 118:34 119:31 121:11 122:8 123:8 124:42 125:5 128:57 129:43 130:98 131:61 132:65 133:158 134:117 136:198 137:111 138:10 139:4 140:33 141:3 142:30 143:25 144:21 145:13 146:137 147:29 148:201 149:11 150:36 151:8 152:136 153:14 154:41 155:87 156:127 157:22 158:2 159:116 160:31 161:30 162:23 163:70 164:10 165:43 167:28 168:102 169:6 170:26 171:1 172:1 173:5 175:16 177:4 179:12 180:14 181:1 182:11 184:5 185:49 186:4 187:24 188:23 190:17 191:13 192:1429 193:292 194:136 195:81 196:142 197:354 198:573 199:277 200:298 201:22 202:579 203:444 204:404 205:186 206:205 207:337 208:42 209:147 210:224 211:4 212:147 213:4 214:10 216:92 217:23 218:20 219:7 220:13 222:4 223:17 End of report