IPv4 R&E Routing Table Report 22:00 GMT Sun 24 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: 23083 Prefixes after maximum aggregation (per Origin AS): 13290 Deaggregation factor: 1.74 Unique aggregates announced (without unneeded subnets): 15373 Number of IPv4 prefixes with a valid ROA: 12573 Number of IPv4 prefixes with an invalid ROA: 20 Number of IPv4 prefixes with no ROA: 10490 Total ASes present in the Internet Routing Table: 2756 Prefixes per ASN: 8.38 Origin-only ASes present in the Internet Routing Table: 2396 Origin ASes announcing only one prefix: 1068 Transit ASes present in the Internet Routing Table: 360 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: 3.2 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: 49891 Number of 32-bit ASNs visible in the Routing Table: 717 Prefixes from 32-bit ASNs in the Routing Table: 1968 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: 231286752 Equivalent to 13 /8s, 201 /16s and 39 /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: 3071 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 4786 Total APNIC prefixes after maximum aggregation: 2354 APNIC Deaggregation factor: 2.03 Prefixes being announced from the APNIC address blocks: 4818 Unique aggregates announced from the APNIC address blocks: 2622 APNIC Region origin ASes present in the Internet Routing Table: 605 APNIC Prefixes per ASN: 7.96 APNIC Region origin ASes announcing only one prefix: 262 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: 45604928 Equivalent to 2 /8s, 183 /16s and 224 /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: 12483 Total ARIN prefixes after maximum aggregation: 7592 ARIN Deaggregation factor: 1.64 Prefixes being announced from the ARIN address blocks: 12265 Unique aggregates announced from the ARIN address blocks: 8957 ARIN Region origin ASes present in the Internet Routing Table: 1323 ARIN Prefixes per ASN: 9.27 ARIN Region origin ASes announcing only one prefix: 467 ARIN Region transit ASes present in the Internet Routing Table: 159 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: 121867104 Equivalent to 7 /8s, 67 /16s and 139 /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: 3430 Total RIPE prefixes after maximum aggregation: 2734 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3600 Unique aggregates announced from the RIPE address blocks: 3004 RIPE Region origin ASes present in the Internet Routing Table: 601 RIPE Prefixes per ASN: 5.99 RIPE Region origin ASes announcing only one prefix: 268 RIPE Region transit ASes present in the Internet Routing Table: 101 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: 154 Number of RIPE addresses announced to Internet: 57502336 Equivalent to 3 /8s, 109 /16s and 106 /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: 1218 Total AfriNIC prefixes after maximum aggregation: 201 AfriNIC Deaggregation factor: 6.06 Prefixes being announced from the AfriNIC address blocks: 1225 Unique aggregates announced from the AfriNIC address blocks: 288 AfriNIC Region origin ASes present in the Internet Routing Table: 43 AfriNIC Prefixes per ASN: 28.49 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: 2.2 Max AfriNIC Region AS path length visible: 7 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 21 Number of AfriNIC addresses announced to Internet: 2456064 Equivalent to 0 /8s, 37 /16s and 122 /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 Informa 7497 466 212 24 CSTNET-AS-AP Computer Network Information 1237 199 72 154 KREONET-AS-KR KISTI, KR 58647 182 18 2 KAGAWAU-AS Kagawa University, JP 4538 181 4191 71 ERX-CERNET-BKB China Education and Resear 7575 166 281 113 AARNET-AS-AP Australian Academic and Rese 55824 152 19 20 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 61 1466 35 ERX-TANET-ASN1 Taiwan Academic Network TA 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 2641 2190 1507 AMAZON-02 - Amazon.com, Inc., US 14618 1324 5162 1001 AMAZON-AES - Amazon.com, Inc., US 5786 197 16 1 UPRENET - University of Puerto Rico, PR 376 196 146 150 RISQ-AS - Reseau dInformations Scientifiq 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 Deutschen 786 210 1684 192 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 1103 100 1759 85 SURFNET-NL SURFnet, The Netherlands, NL 8895 98 24 5 ISU Internet Services Unit ISU, SA 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/Internet2/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 308 161 43 Rede Nacional de Ensino e Pesquisa, BR 11340 110 25 49 Red Universitaria Nacional, CL 3596 69 8 4 Universidad Autonoma Metropolitana, MX 271640 65 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR 2715 57 84 39 Fundacao Carlos Chagas Filho de Amparo a 19611 53 17 2 Associacao Antonio Vieira - Unisinos, BR 61468 51 3 20 CEDIA, EC 1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S 21612 27 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR 20191 26 16 1 Pontificia Universidad Catolica de Chile, 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 553 82 3 KENET-AS, KE 2018 374 318 69 TENET-1, ZA 2561 68 4 34 EUN, EG 8094 46 48 21 PUKNET, ZA 37215 45 8 1 MAREN, MW 6879 24 2 9 ENSTINET-, EG 30983 12 4 2 MARWAN-AS, MA 37501 11 49 6 UOFS, ZA 327700 11 16 1 MoRENet, MZ 37182 10 8 1 TERNET, TZ 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 2641 2190 1507 AMAZON-02 - Amazon.com, Inc., US 14618 1324 5162 1001 AMAZON-AES - Amazon.com, Inc., US 2907 612 2153 465 SINET-AS Research Organization of Informa 36914 553 82 3 KENET-AS, KE 7497 466 212 24 CSTNET-AS-AP Computer Network Information 2018 374 318 69 TENET-1, ZA 1916 308 161 43 Rede Nacional de Ensino e Pesquisa, BR 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 786 210 1684 192 JANET Jisc Services Limited, GB 1237 199 72 154 KREONET-AS-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 553 550 KENET-AS, KE 7497 466 442 CSTNET-AS-AP Computer Network Information Cente 14618 1324 323 AMAZON-AES - Amazon.com, Inc., US 2018 374 305 TENET-1, ZA 1916 308 265 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 a 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 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 208.64.40.0/24 Origin: 14618 AMAZON-AES - Amazon.com, Inc., US 208.64.40.0/24 Transit: 16509 AMAZON-02 - Amazon.com, Inc., US 208.64.41.0/24 Origin: 16509 AMAZON-02 - Amazon.com, Inc., US 208.64.41.0/24 Transit: 11537 INTERNET2-RESEARCH-EDU - Internet2, US 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 /16:2020 /17:457 /18:507 /19:667 /20:961 /21:1049 /22:1628 /23:1806 /24:13413 /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 529 553 KENET-AS, KE 16509 414 2641 AMAZON-02 - Amazon.com, Inc., US 14618 380 1324 AMAZON-AES - Amazon.com, Inc., US 8895 95 98 ISU Internet Services Unit ISU, SA 1916 88 308 Rede Nacional de Ensino e Pesquisa, BR 31638 48 48 ASN-LEPIDA, IT 37215 39 45 MAREN, MW 1 38 122 LVLT-1 - Level 3 Parent, LLC, US 200521 34 58 SEAP-AGE, 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 5:27 6:5 8:2 12:2 13:81 14:96 15:104 16:32 18:106 23:129 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 99:49 101:5 102:8 103:362 104:118 107:9 108:25 109:16 110:1 111:7 113:2 114:24 116:12 117:7 118:33 119:36 121:19 122:8 123:8 124:42 125:3 128:58 129:51 130:122 131:78 132:62 133:157 134:128 135:4 136:228 137:73 138:12 139:17 140:45 141:15 142:52 143:44 144:19 145:16 146:137 147:78 148:85 149:22 150:38 151:29 152:137 153:62 154:38 155:119 156:125 157:43 158:37 159:181 160:36 161:44 162:65 163:91 164:20 165:67 166:2 167:48 168:146 169:13 170:82 171:1 172:10 173:21 174:2 175:15 176:2 177:6 178:1 179:12 180:16 181:2 182:11 184:7 185:71 186:4 187:8 188:24 190:17 191:13 192:1637 193:321 194:115 195:95 196:150 197:339 198:566 199:348 200:315 201:5 202:617 203:420 204:427 205:159 206:228 207:264 208:106 209:122 210:233 211:15 212:139 213:16 214:8 216:189 217:25 218:21 219:7 220:16 222:4 223:17 End of report