IPv4 R&E Routing Table Report 22:00 GMT Wed 27 May, 2026 IPv4 BGP Table (R&E) as seen at Internet2. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/Internet2/ Analysis Summary ---------------- BGP routing table entries examined: 23112 Prefixes after maximum aggregation (per Origin AS): 13294 Deaggregation factor: 1.74 Unique aggregates announced (without unneeded subnets): 15396 Number of IPv4 prefixes with a valid ROA: 12595 Number of IPv4 prefixes with an invalid ROA: 15 Number of IPv4 prefixes with no ROA: 10502 Total ASes present in the Internet Routing Table: 2757 Prefixes per ASN: 8.38 Origin-only ASes present in the Internet Routing Table: 2396 Origin ASes announcing only one prefix: 1065 Transit ASes present in the Internet Routing Table: 361 Transit-only ASes present in the Internet Routing Table: 58 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 3.2 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: 49892 Number of 32-bit ASNs visible in the Routing Table: 715 Prefixes from 32-bit ASNs in the Routing Table: 1970 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: 231238624 Equivalent to 13 /8s, 200 /16s and 107 /24s Percentage of available address space announced: 6.2 Percentage of allocated address space announced: 6.2 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: 3074 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4807 Total APNIC prefixes after maximum aggregation: 2357 APNIC Deaggregation factor: 2.04 Prefixes being announced from the APNIC address blocks: 4839 Unique aggregates announced from the APNIC address blocks: 2643 APNIC Region origin ASes present in the Internet Routing Table: 607 APNIC Prefixes per ASN: 7.97 APNIC Region origin ASes announcing only one prefix: 260 APNIC Region transit ASes present in the Internet Routing Table: 53 Average APNIC Region AS path length visible: 3.6 Max APNIC Region AS path length visible: 11 Number of APNIC region 32-bit ASNs visible in the Routing Table: 251 Number of APNIC addresses announced to Internet: 45610304 Equivalent to 2 /8s, 183 /16s and 245 /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: 12486 Total ARIN prefixes after maximum aggregation: 7594 ARIN Deaggregation factor: 1.64 Prefixes being announced from the ARIN address blocks: 12270 Unique aggregates announced from the ARIN address blocks: 8961 ARIN Region origin ASes present in the Internet Routing Table: 1322 ARIN Prefixes per ASN: 9.28 ARIN Region origin ASes announcing only one prefix: 466 ARIN Region transit ASes present in the Internet Routing Table: 160 Average ARIN Region AS path length visible: 3.0 Max ARIN Region AS path length visible: 15 Number of ARIN region 32-bit ASNs visible in the Routing Table: 235 Number of ARIN addresses announced to Internet: 121807712 Equivalent to 7 /8s, 66 /16s and 163 /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: 3426 Total RIPE prefixes after maximum aggregation: 2731 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3596 Unique aggregates announced from the RIPE address blocks: 3000 RIPE Region origin ASes present in the Internet Routing Table: 599 RIPE Prefixes per ASN: 6.00 RIPE Region origin ASes announcing only one prefix: 267 RIPE Region transit ASes present in the Internet Routing Table: 100 Average RIPE Region AS path length visible: 3.6 Max RIPE Region AS path length visible: 13 Number of RIPE region 32-bit ASNs visible in the Routing Table: 153 Number of RIPE addresses announced to Internet: 57497472 Equivalent to 3 /8s, 109 /16s and 87 /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: 1163 Total LACNIC prefixes after maximum aggregation: 406 LACNIC Deaggregation factor: 2.86 Prefixes being announced from the LACNIC address blocks: 1171 Unique aggregates announced from the LACNIC address blocks: 498 LACNIC Region origin ASes present in the Internet Routing Table: 124 LACNIC Prefixes per ASN: 9.44 LACNIC Region origin ASes announcing only one prefix: 51 LACNIC Region transit ASes present in the Internet Routing Table: 21 Average LACNIC Region AS path length visible: 3.6 Max LACNIC Region AS path length visible: 8 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 56 Number of LACNIC addresses announced to Internet: 3855296 Equivalent to 0 /8s, 58 /16s and 211 /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: 1227 Total AfriNIC prefixes after maximum aggregation: 203 AfriNIC Deaggregation factor: 6.04 Prefixes being announced from the AfriNIC address blocks: 1233 Unique aggregates announced from the AfriNIC address blocks: 291 AfriNIC Region origin ASes present in the Internet Routing Table: 44 AfriNIC Prefixes per ASN: 28.02 AfriNIC Region origin ASes announcing only one prefix: 21 AfriNIC Region transit ASes present in the Internet Routing Table: 12 Average AfriNIC Region AS path length visible: 2.2 Max AfriNIC Region AS path length visible: 5 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 20 Number of AfriNIC addresses announced to Internet: 2465280 Equivalent to 0 /8s, 37 /16s and 158 /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 612 2153 465 SINET-AS - Research Organization of Infor 7497 465 212 24 CSTNET-AS-AP - Computer Network Informati 1237 199 72 154 KREONET-AS-KR-KR - KISTI, KR 58647 182 18 2 KAGAWAU-AS - Kagawa University, JP 4538 181 4191 71 ERX-CERNET-BKB - China Education and Rese 7575 166 281 113 AARNET-AS-AP - Australian Academic and Re 55824 152 19 20 NKN-CORE-NW - NKN Core Network, IN 4762 75 4 1 MAHIDOL-BORDER-AS - Mahidol University, T 6262 63 134 56 CSIRO - Commonwealth Scientific and Indus 1659 61 1466 35 ERX-TANET-ASN1 - Taiwan Academic Network Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 16509 2643 2190 1509 AMAZON-02 - Amazon.com, Inc., US 14618 1321 5162 998 AMAZON-AES - Amazon.com, Inc., US 5786 197 16 1 UPRENET - University of Puerto Rico, PR 376 196 146 150 RISQ-AS - Reseau d'Informations Scientifi 668 190 609 163 DNIC-AS-00668 - United States Department 2920 173 34 7 LACOE - Los Angeles County Office of Educ 2152 145 491 95 CENIC-2152 - CENIC, US 270 142 517 94 AS270 - National Aeronautics and Space Ad 18558 140 18 4 NETBLK-RCOEK - Riverside County Office of 1 122 2 47 LVLT-1 - Level 3 Parent, LLC, US Complete listing at https://bgp.nsrc.org/REN/Internet2/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 Deutsch 786 210 1684 192 JANET - Jisc Services Limited, GB 559 115 533 105 Switch - SWITCH, CH 1103 100 1759 85 SURFNET-NL - SURF B.V., NL 8895 98 24 5 ISU - King Abdul Aziz City for Science an 2614 87 26 67 RoEduNet - Agentia de Administrare a Rete 137 82 677 77 ASGARR - Consortium GARR, IT 1930 78 88 73 RCCN - Fundacao para a Ciencia e a Tecnol 553 75 366 75 BELWUE - Universitaet Stuttgart, DE 2200 64 630 59 FR-RENATER - Renater, FR Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 308 161 43 AS1916 - Rede Nacional de Ensino e Pesqui 11340 110 25 49 AS11340 - Red Universitaria Nacional, CL 3596 69 8 4 AS3596 - Universidad Autonoma Metropolita 271640 65 8 1 AS271640 - UNIVERSIDADE FEDERAL DE VICOSA 2715 57 84 39 AS2715 - Fundacao Carlos Chagas Filho de 19611 53 17 2 AS19611 - Associacao Antonio Vieira - Uni 61468 51 3 20 AS61468 - CEDIA, EC 1251 37 31 26 AS1251 - FUNDACAO DE AMPARO A PESQUISA DO 21612 27 16 1 AS21612 - FUNDACAO INSTITUTO OSWALDO CRUZ 20191 26 16 1 AS20191 - Pontificia Universidad Catolica Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 555 82 3 Kenya Education Network - Kenya Education 2018 375 318 69 TENET (The UNINET Project) - TENET (The U 2561 68 4 34 Egyptian Universities Network (EUN) - Egy 8094 46 48 21 North West University - North West Univer 37215 45 8 1 Malawi Research and Education Network - M 6879 24 2 9 ENSTINET - ENSTINET, EG 327700 13 16 1 Mozambique Research & Education Network - 30983 12 4 2 CNRST (Centre National pour la Recherche 37501 11 49 6 University of the Free State - University 37182 10 8 1 Tanzania Education And Research Network - Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 16509 2643 2190 1509 AMAZON-02 - Amazon.com, Inc., US 14618 1321 5162 998 AMAZON-AES - Amazon.com, Inc., US 2907 612 2153 465 SINET-AS - Research Organization of Infor 36914 555 82 3 Kenya Education Network - Kenya Education 7497 465 212 24 CSTNET-AS-AP - Computer Network Informati 2018 375 318 69 TENET (The UNINET Project) - TENET (The U 1916 308 161 43 AS1916 - Rede Nacional de Ensino e Pesqui 680 291 1883 253 DFN - Verein zur Foerderung eines Deutsch 786 210 1684 192 JANET - Jisc Services Limited, GB 1237 199 72 154 KREONET-AS-KR-KR - KISTI, KR Complete listing at https://bgp.nsrc.org/REN/Internet2/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 555 552 Kenya Education Network - Kenya Education Netwo 7497 465 441 CSTNET-AS-AP - Computer Network Information Cen 14618 1321 323 AMAZON-AES - Amazon.com, Inc., US 2018 375 306 TENET (The UNINET Project) - TENET (The UNINET 1916 308 265 AS1916 - 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, 2907 612 147 SINET-AS - Research Organization of Information 18558 140 136 NETBLK-RCOEK - Riverside County Office of Educa Complete listing at https://bgp.nsrc.org/REN/Internet2/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/Internet2/data-badAS Advertised Unallocated Addresses -------------------------------- Unassigned Network ASN Information AS Name 164.160.192.0/21 Origin: 37661 Nigerian Research and Education Network 164.160.192.0/21 Transit: 37288 West and Central African Research Networ 202.14.117.0/24 Origin: 17827 STOU-AS-TH - Sukhothai Thammathirat Open 202.14.117.0/24 Transit: 4621 UNINET-AS-AP - UNINET-TH, TH 203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP - Adelaide Uni 203.9.156.0/24 Transit: 7575 AARNET-AS-AP - Australian Academic and R Complete listing at https://bgp.nsrc.org/REN/Internet2/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 /11:2 /12:18 /13:28 /14:53 /15:155 /16:2019 /17:457 /18:508 /19:666 /20:962 /21:1050 /22:1629 /23:1808 /24:13438 /25:64 /26:83 /27:106 /28:8 /29:52 /30:0 /31:0 /32:4 Advertised prefixes smaller than registry allocations ----------------------------------------------------- ASN No of nets Total ann. Description 36914 531 555 Kenya Education Network - Kenya Education Network, KE 16509 414 2643 AMAZON-02 - Amazon.com, Inc., US 14618 380 1321 AMAZON-AES - Amazon.com, Inc., US 8895 95 98 ISU - King Abdul Aziz City for Science and Technology, SA 1916 88 308 AS1916 - Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA - Lepida S.c.p.A., IT 37215 39 45 Malawi Research and Education Network - MAREN - Malawi Research and Education Network - MAREN, MW 1 38 122 LVLT-1 - Level 3 Parent, LLC, US 200521 34 58 SEAP-AGE - Ministerio de Transformacion Digital y de la Funcion Publica, ES 46115 32 35 LUTHER - Luther College, US Complete listing at https://bgp.nsrc.org/REN/Internet2/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:18 3:197 4:2 5:28 6:5 8:2 12:2 13:81 14:96 15:104 16:32 18:106 23:130 24:13 31:5 35:37 37:26 38:11 40:6 41:237 42:16 44:6 45:63 46:6 47:1 49:13 50:8 52:371 54:49 58:13 59:20 60:6 61:3 62:6 63:34 64:117 65:23 66:92 67:64 68:27 69:52 70:3 72:22 74:90 75:1 76:32 77:6 78:3 79:6 80:8 81:27 82:4 83:7 84:13 85:30 86:4 87:1 88:1 89:24 91:45 92:2 93:46 94:3 95:2 96:9 97:1 98:10 99:49 101:5 102:8 103:365 104:118 107:8 108:25 109:16 110:1 111:7 113:2 114:24 116:12 117:7 118:33 119:36 121:19 122:8 123:8 124:42 125:3 128:58 129:52 130:122 131:79 132:62 133:157 134:129 135:4 136:225 137:73 138:12 139:17 140:45 141:15 142:52 143:44 144:19 145:16 146:137 147:78 148:85 149:22 150:38 151:29 152:137 153:62 154:41 155:122 156:125 157:42 158:37 159:180 160:36 161:46 162:66 163:91 164:20 165:68 166:2 167:48 168:146 169:13 170:82 171:1 172:10 173:21 174:2 175:15 176:2 177:6 178:1 179:12 180:16 181:2 182:11 184:7 185:71 186:4 187:8 188:24 190:17 191:13 192:1634 193:321 194:113 195:95 196:150 197:342 198:566 199:348 200:315 201:5 202:617 203:436 204:427 205:160 206:228 207:264 208:104 209:122 210:233 211:15 212:139 213:16 214:8 216:189 217:25 218:21 219:7 220:16 222:4 223:17 End of report