IPv4 R&E Routing Table Report 17:00 GMT Wed 18 Mar, 2026 IPv4 BGP Table (R&E) as seen at GEANT. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/GEANT/ Analysis Summary ---------------- BGP routing table entries examined: 18686 Prefixes after maximum aggregation (per Origin AS): 10452 Deaggregation factor: 1.79 Unique aggregates announced (without unneeded subnets): 11562 Number of IPv4 prefixes with a valid ROA: 8288 Number of IPv4 prefixes with an invalid ROA: 2 Number of IPv4 prefixes with no ROA: 10396 Total ASes present in the Internet Routing Table: 2669 Prefixes per ASN: 7.00 Origin-only ASes present in the Internet Routing Table: 2314 Origin ASes announcing only one prefix: 1030 Transit ASes present in the Internet Routing Table: 355 Transit-only ASes present in the Internet Routing Table: 57 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 3.9 Max AS path length visible: 15 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 3 Number of instances of unregistered ASNs: 3 Number of 32-bit ASNs allocated by the RIRs: 49005 Number of 32-bit ASNs visible in the Routing Table: 682 Prefixes from 32-bit ASNs in the Routing Table: 1876 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: 195550240 Equivalent to 11 /8s, 167 /16s and 220 /24s Percentage of available address space announced: 5.3 Percentage of allocated address space announced: 5.3 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: 2168 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4728 Total APNIC prefixes after maximum aggregation: 2321 APNIC Deaggregation factor: 2.04 Prefixes being announced from the APNIC address blocks: 4728 Unique aggregates announced from the APNIC address blocks: 2549 APNIC Region origin ASes present in the Internet Routing Table: 590 APNIC Prefixes per ASN: 8.01 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: 3.8 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 244 Number of APNIC addresses announced to Internet: 43341888 Equivalent to 2 /8s, 149 /16s and 88 /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: 8074 Total ARIN prefixes after maximum aggregation: 4749 ARIN Deaggregation factor: 1.70 Prefixes being announced from the ARIN address blocks: 8088 Unique aggregates announced from the ARIN address blocks: 5341 ARIN Region origin ASes present in the Internet Routing Table: 1258 ARIN Prefixes per ASN: 6.43 ARIN Region origin ASes announcing only one prefix: 437 ARIN Region transit ASes present in the Internet Routing Table: 151 Average ARIN Region AS path length visible: 4.2 Max ARIN Region AS path length visible: 15 Number of ARIN region 32-bit ASNs visible in the Routing Table: 212 Number of ARIN addresses announced to Internet: 89487104 Equivalent to 5 /8s, 85 /16s and 119 /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, 393216-404380 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: 3380 Total RIPE prefixes after maximum aggregation: 2697 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3363 Unique aggregates announced from the RIPE address blocks: 2735 RIPE Region origin ASes present in the Internet Routing Table: 595 RIPE Prefixes per ASN: 5.65 RIPE Region origin ASes announcing only one prefix: 268 RIPE Region transit ASes present in the Internet Routing Table: 102 Average RIPE Region AS path length visible: 2.8 Max RIPE Region AS path length visible: 12 Number of RIPE region 32-bit ASNs visible in the Routing Table: 152 Number of RIPE addresses announced to Internet: 56458880 Equivalent to 3 /8s, 93 /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: 1291 Total LACNIC prefixes after maximum aggregation: 475 LACNIC Deaggregation factor: 2.72 Prefixes being announced from the LACNIC address blocks: 1289 Unique aggregates announced from the LACNIC address blocks: 642 LACNIC Region origin ASes present in the Internet Routing Table: 125 LACNIC Prefixes per ASN: 10.31 LACNIC Region origin ASes announcing only one prefix: 53 LACNIC Region transit ASes present in the Internet Routing Table: 24 Average LACNIC Region AS path length visible: 4.6 Max LACNIC Region AS path length visible: 14 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 55 Number of LACNIC addresses announced to Internet: 3861088 Equivalent to 0 /8s, 58 /16s and 234 /24s LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247, 61440-61951, 64099-64197, 262144-275868 + 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: 1210 Total AfriNIC prefixes after maximum aggregation: 207 AfriNIC Deaggregation factor: 5.85 Prefixes being announced from the AfriNIC address blocks: 1215 Unique aggregates announced from the AfriNIC address blocks: 292 AfriNIC Region origin ASes present in the Internet Routing Table: 41 AfriNIC Prefixes per ASN: 29.63 AfriNIC Region origin ASes announcing only one prefix: 20 AfriNIC Region transit ASes present in the Internet Routing Table: 11 Average AfriNIC Region AS path length visible: 4.1 Max AfriNIC Region AS path length visible: 9 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 19 Number of AfriNIC addresses announced to Internet: 2398720 Equivalent to 0 /8s, 36 /16s and 154 /24s AfriNIC AS Blocks 36864-37887, 327680-330751 & 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 606 2153 462 SINET-AS Research Organization of Informa 7497 454 180 23 CSTNET-AS-AP Computer Network Information 1237 200 72 154 KREONET-AS-KR KISTI, KR 4538 191 4192 72 ERX-CERNET-BKB China Education and Resear 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 7575 165 281 112 AARNET-AS-AP Australian Academic and Rese 55824 152 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 1659 60 954 34 ERX-TANET-ASN1 Taiwan Academic Network TA Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 376 197 162 151 RISQ-AS - Reseau dInformations Scientifiq 5786 197 16 1 UPRENET - University of Puerto Rico, PR 668 184 587 157 DNIC-AS-00668 - United States Department 2920 173 34 7 LACOE - Los Angeles County Office of Educ 2152 147 491 96 CENIC-2152 - CENIC, US 18558 140 18 4 NETBLK-RCOEK - Riverside County Office of 81 115 455 35 NCREN - MCNC, US 21976 92 34 14 NJEDGE-NET - NJEDge.Net, Inc., US 270 84 247 34 AS270 - National Aeronautics and Space Ad 237 83 542 49 MERIT-AS-14 - Merit Network Inc., US Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet-ARIN RIPE Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 786 209 1731 188 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 8895 103 24 5 ISU Internet Services Unit ISU, SA 1103 99 1503 84 SURFNET-NL SURFnet, The Netherlands, NL 2614 87 26 67 ROEDUNET, RO 137 82 677 77 ASGARR Consortium GARR, IT 1930 78 88 73 RCCN Fundacao para a Ciencia e a Tecnolog 553 75 366 75 BELWUE BelWue-Koordination, DE 2200 64 630 59 FR-RENATER Reseau National de telecommuni Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 290 161 43 Rede Nacional de Ensino e Pesquisa, BR 28391 161 10 72 Universidad Juarez Autonoma de Tabasco, M 11340 110 25 49 Red Universitaria Nacional, CL 3596 69 8 4 Universidad Autonoma Metropolitana, MX 271640 66 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 19611 53 17 2 Associacao Antonio Vieira - Unisinos, BR 61468 52 3 21 CEDIA, EC 2715 51 84 38 Fundacao Carlos Chagas Filho de Amparo a 1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 21612 27 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 549 82 3 KENET-AS, KE 2018 375 318 69 TENET-1, ZA 2561 68 4 34 EUN, EG 8094 46 48 21 PUKNET, ZA 37215 44 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 37501 11 49 6 UOFS, ZA 327700 10 1 10 MoRENet, MZ 37182 9 8 1 TERNET, TZ Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2907 606 2153 462 SINET-AS Research Organization of Informa 36914 549 82 3 KENET-AS, KE 7497 454 180 23 CSTNET-AS-AP Computer Network Information 2018 375 318 69 TENET-1, ZA 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 1916 290 161 43 Rede Nacional de Ensino e Pesquisa, BR 786 209 1731 188 JANET Jisc Services Limited, GB 1237 200 72 154 KREONET-AS-KR KISTI, KR 376 197 162 151 RISQ-AS - Reseau dInformations Scientifiq 5786 197 16 1 UPRENET - University of Puerto Rico, PR Complete listing at https://bgp.nsrc.org/REN/GEANT/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 549 546 KENET-AS, KE 7497 454 431 CSTNET-AS-AP Computer Network Information Cente 2018 375 306 TENET-1, ZA 1916 290 247 Rede Nacional de Ensino e Pesquisa, BR 5786 197 196 UPRENET - University of Puerto Rico, PR 58647 182 180 KAGAWAU-AS Kagawa University, JP 2920 173 166 LACOE - Los Angeles County Office of Education, 18558 140 136 NETBLK-RCOEK - Riverside County Office of Educa 55824 152 131 NKN-CORE-NW NKN Core Network, IN 4538 191 119 ERX-CERNET-BKB China Education and Research Net Complete listing at https://bgp.nsrc.org/REN/GEANT/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 - University 64011 UNALLOCATED 130.215.0.0/16 10326 WPI - Worcester Polytec 401367 UNALLOCATED 216.186.25.0/24 10430 WA-K20 - Washington Sta Complete listing at https://bgp.nsrc.org/REN/GEANT/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 Adelaide Unive 203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res Complete listing at https://bgp.nsrc.org/REN/GEANT/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 /11:0 /12:10 /13:18 /14:35 /15:113 /16:1958 /17:418 /18:457 /19:592 /20:814 /21:885 /22:1356 /23:1514 /24:10326 /25:60 /26:81 /27:47 /28:0 /29:0 /30:0 /31:0 /32:0 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 525 549 KENET-AS, KE 8895 100 103 ISU Internet Services Unit ISU, SA 1916 86 290 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 38 44 MAREN, MW 32440 35 55 LONI - Louisiana Board of RegentsLouisiana Optical Network Initiative LONI, US 200521 34 58 SEAP-AGE, ES 46115 32 35 LUTHER - Luther College, US 25977 30 44 HCCS - HOUSTON COMMUNITY COLLEGE SYSTEM, US 27609 29 45 USC-UNIVERSITY-HOSPITAL - USC-University Hospital, US Complete listing at https://bgp.nsrc.org/REN/GEANT/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:18 6:5 8:2 12:1 14:95 23:9 24:1 31:1 35:3 37:26 38:11 40:1 41:228 42:18 44:6 45:36 46:5 47:1 49:13 50:3 58:15 59:20 60:6 61:3 62:6 63:32 64:44 65:6 66:38 67:40 68:12 69:17 70:2 72:6 74:54 76:35 77:4 78:3 79:5 80:7 81:27 82:3 83:6 84:7 85:26 86:1 87:1 89:17 91:38 93:14 94:2 95:2 96:5 97:1 98:2 101:5 102:4 103:341 104:76 108:8 109:10 110:1 111:3 113:2 114:24 116:7 117:5 118:32 119:27 121:17 122:8 123:8 124:42 125:3 128:58 129:47 130:102 131:65 132:65 133:157 134:117 136:200 137:63 138:9 139:5 140:33 141:4 142:30 143:26 144:2 145:3 146:136 147:66 148:231 149:11 150:36 151:9 152:116 153:15 154:40 155:87 156:128 157:27 158:28 159:111 160:34 161:34 162:21 163:76 164:11 165:44 166:1 167:19 168:104 169:6 170:17 172:1 173:5 175:15 177:6 179:12 180:16 181:1 182:11 184:6 185:41 186:3 187:8 188:22 190:17 191:13 192:1462 193:311 194:110 195:97 196:148 197:342 198:456 199:279 200:293 201:5 202:596 203:433 204:382 205:125 206:200 207:214 208:35 209:92 210:231 211:15 212:139 213:4 214:9 216:86 217:22 218:21 219:7 220:16 222:4 223:6 End of report