IPv4 R&E Routing Table Report 20:30 GMT Tue 21 Apr, 2026 IPv4 BGP Table (R&E) as seen at PREGINET. Report Website: https://bgp.nsrc.org/REN Detailed Analysis: https://bgp.nsrc.org/REN/PREGINET/ Analysis Summary ---------------- BGP routing table entries examined: 16347 Prefixes after maximum aggregation (per Origin AS): 9272 Deaggregation factor: 1.76 Unique aggregates announced (without unneeded subnets): 10497 Number of IPv4 prefixes with a valid ROA: 7873 Number of IPv4 prefixes with an invalid ROA: 36 Number of IPv4 prefixes with no ROA: 8438 Total ASes present in the Internet Routing Table: 2430 Prefixes per ASN: 6.73 Origin-only ASes present in the Internet Routing Table: 2085 Origin ASes announcing only one prefix: 934 Transit ASes present in the Internet Routing Table: 345 Transit-only ASes present in the Internet Routing Table: 68 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 7.4 Max AS path length visible: 20 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: 49405 Number of 32-bit ASNs visible in the Routing Table: 641 Prefixes from 32-bit ASNs in the Routing Table: 1803 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: 157534464 Equivalent to 9 /8s, 99 /16s and 201 /24s Percentage of available address space announced: 4.3 Percentage of allocated address space announced: 4.3 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: 2071 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3361 Total APNIC prefixes after maximum aggregation: 1504 APNIC Deaggregation factor: 2.23 Prefixes being announced from the APNIC address blocks: 3362 Unique aggregates announced from the APNIC address blocks: 1593 APNIC Region origin ASes present in the Internet Routing Table: 449 APNIC Prefixes per ASN: 7.49 APNIC Region origin ASes announcing only one prefix: 191 APNIC Region transit ASes present in the Internet Routing Table: 48 Average APNIC Region AS path length visible: 5.4 Max APNIC Region AS path length visible: 13 Number of APNIC region 32-bit ASNs visible in the Routing Table: 208 Number of APNIC addresses announced to Internet: 31195136 Equivalent to 1 /8s, 220 /16s and 0 /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: 7457 Total ARIN prefixes after maximum aggregation: 4608 ARIN Deaggregation factor: 1.62 Prefixes being announced from the ARIN address blocks: 7467 Unique aggregates announced from the ARIN address blocks: 5475 ARIN Region origin ASes present in the Internet Routing Table: 1204 ARIN Prefixes per ASN: 6.20 ARIN Region origin ASes announcing only one prefix: 432 ARIN Region transit ASes present in the Internet Routing Table: 152 Average ARIN Region AS path length visible: 8.6 Max ARIN Region AS path length visible: 20 Number of ARIN region 32-bit ASNs visible in the Routing Table: 219 Number of ARIN addresses announced to Internet: 65944576 Equivalent to 3 /8s, 238 /16s and 60 /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: 3181 Total RIPE prefixes after maximum aggregation: 2526 RIPE Deaggregation factor: 1.26 Prefixes being announced from the RIPE address blocks: 3172 Unique aggregates announced from the RIPE address blocks: 2591 RIPE Region origin ASes present in the Internet Routing Table: 543 RIPE Prefixes per ASN: 5.84 RIPE Region origin ASes announcing only one prefix: 243 RIPE Region transit ASes present in the Internet Routing Table: 98 Average RIPE Region AS path length visible: 6.0 Max RIPE Region AS path length visible: 15 Number of RIPE region 32-bit ASNs visible in the Routing Table: 141 Number of RIPE addresses announced to Internet: 54063616 Equivalent to 3 /8s, 56 /16s and 242 /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: 478 LACNIC Deaggregation factor: 2.57 Prefixes being announced from the LACNIC address blocks: 1229 Unique aggregates announced from the LACNIC address blocks: 652 LACNIC Region origin ASes present in the Internet Routing Table: 125 LACNIC Prefixes per ASN: 9.83 LACNIC Region origin ASes announcing only one prefix: 50 LACNIC Region transit ASes present in the Internet Routing Table: 23 Average LACNIC Region AS path length visible: 9.1 Max LACNIC Region AS path length visible: 18 Number of LACNIC region 32-bit ASNs visible in the Routing Table: 54 Number of LACNIC addresses announced to Internet: 3913984 Equivalent to 0 /8s, 59 /16s and 185 /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: 1115 Total AfriNIC prefixes after maximum aggregation: 153 AfriNIC Deaggregation factor: 7.29 Prefixes being announced from the AfriNIC address blocks: 1114 Unique aggregates announced from the AfriNIC address blocks: 183 AfriNIC Region origin ASes present in the Internet Routing Table: 38 AfriNIC Prefixes per ASN: 29.32 AfriNIC Region origin ASes announcing only one prefix: 18 AfriNIC Region transit ASes present in the Internet Routing Table: 10 Average AfriNIC Region AS path length visible: 7.2 Max AfriNIC Region AS path length visible: 11 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 19 Number of AfriNIC addresses announced to Internet: 2414592 Equivalent to 0 /8s, 36 /16s and 216 /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 7497 457 212 24 CSTNET-AS-AP Computer Network Information 1237 199 72 154 KREONET-AS-KR KISTI, KR 4538 184 4192 72 ERX-CERNET-BKB China Education and Resear 55824 153 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 61 1466 35 ERX-TANET-ASN1 Taiwan Academic Network TA 4621 56 35 8 UNINET-AS-AP UNINET-, TH 9317 50 16 1 ITISNET-AS INHA UNIVERSITY, KR 38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw Complete listing at https://bgp.nsrc.org/REN/PREGINET/data-ASnet-APNIC ARIN Region per AS prefix count summary --------------------------------------- ASN No of nets /20 equiv MaxAgg Description 2152 566 93 328 CENIC-2152 - CENIC, US 376 197 162 151 RISQ-AS - Reseau dInformations Scientifiq 5786 197 16 1 UPRENET - University of Puerto Rico, PR 81 115 455 35 NCREN - MCNC, US 21976 94 34 16 NJEDGE-NET - NJEDge.Net, Inc., US 237 83 542 49 MERIT-AS-14 - Merit Network Inc., US 1736 79 16 1 MU-AS - Marquette University, US 3477 77 63 40 NOAA-NWAVE - National Oceanic and Atmosph 2920 72 12 61 LACOE - Los Angeles County Office of Educ 22742 70 37 32 CT-EDU-NET - Connecticut Education Networ Complete listing at https://bgp.nsrc.org/REN/PREGINET/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 786 208 1714 189 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 100 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/PREGINET/data-ASnet-RIPE LACNIC Region per AS prefix count summary ----------------------------------------- ASN No of nets /20 equiv MaxAgg Description 1916 218 161 40 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 66 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 52 3 21 CEDIA, EC 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/PREGINET/data-ASnet-LACNIC AfriNIC Region per AS prefix count summary ------------------------------------------ ASN No of nets /20 equiv MaxAgg Description 36914 556 82 3 KENET-AS, KE 2018 373 318 69 TENET-1, ZA 8094 46 48 21 PUKNET, ZA 37215 45 8 1 MAREN, MW 37501 11 49 6 UOFS, ZA 327700 11 16 1 MoRENet, MZ 37182 10 8 1 TERNET, TZ 37654 9 1 5 RwEdNet-AS, RW 36982 8 33 8 UCT, ZA 329522 4 1 2 SANSA, ZA Complete listing at https://bgp.nsrc.org/REN/PREGINET/data-ASnet-AFRINIC Global Per AS prefix count summary ---------------------------------- ASN No of nets /20 equiv MaxAgg Description 2152 566 93 328 CENIC-2152 - CENIC, US 36914 556 82 3 KENET-AS, KE 7497 457 212 24 CSTNET-AS-AP Computer Network Information 2018 373 318 69 TENET-1, ZA 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 1916 218 161 40 Rede Nacional de Ensino e Pesquisa, BR 786 208 1714 189 JANET Jisc Services Limited, GB 1237 199 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/PREGINET/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 36914 556 553 KENET-AS, KE 7497 457 433 CSTNET-AS-AP Computer Network Information Cente 2018 373 304 TENET-1, ZA 5786 197 196 UPRENET - University of Puerto Rico, PR 1916 218 178 Rede Nacional de Ensino e Pesquisa, BR 55824 153 132 NKN-CORE-NW NKN Core Network, IN 4538 184 112 ERX-CERNET-BKB China Education and Research Net 8895 100 95 ISU Internet Services Unit ISU, SA 28391 161 89 Universidad Juarez Autonoma de Tabasco, MX 81 115 80 NCREN - MCNC, US Complete listing at https://bgp.nsrc.org/REN/PREGINET/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/PREGINET/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/PREGINET/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 /9:0 /10:0 /11:1 /12:11 /13:18 /14:31 /15:110 /16:1582 /17:358 /18:388 /19:507 /20:713 /21:743 /22:1248 /23:1397 /24:9239 /25:1 /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 532 556 KENET-AS, KE 8895 97 100 ISU Internet Services Unit ISU, SA 2152 77 566 CENIC-2152 - CENIC, US 31638 48 48 ASN-LEPIDA, IT 37215 39 45 MAREN, MW 46115 32 35 LUTHER - Luther College, US 200521 32 56 SEAP-AGE, ES 25977 30 44 HCCS - HOUSTON COMMUNITY COLLEGE SYSTEM, US 40326 29 33 ECKERD-COLLEGE - Eckerd College, US 61468 25 52 CEDIA, EC Complete listing at https://bgp.nsrc.org/REN/PREGINET/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:17 8:13 12:2 14:96 23:11 24:1 31:1 35:3 37:26 38:10 40:1 41:237 42:16 44:1 45:32 46:4 49:13 50:5 58:14 59:20 60:6 61:3 62:6 63:3 64:41 65:6 66:56 67:41 68:6 69:12 70:3 72:6 74:57 76:25 77:4 78:3 79:5 80:6 81:27 82:3 83:7 84:8 85:26 86:4 89:16 91:37 93:14 94:2 95:2 96:5 97:1 98:3 101:5 102:5 103:268 104:43 108:9 109:9 111:3 113:2 114:24 116:9 117:5 118:33 119:35 121:16 122:8 123:8 124:42 125:3 128:34 129:48 130:90 131:63 132:63 134:105 136:198 137:106 138:3 139:5 140:32 141:3 142:32 143:23 144:8 145:13 146:134 147:64 148:234 149:10 150:31 151:9 152:122 153:14 154:37 155:84 156:22 157:25 158:28 159:112 160:8 161:34 162:23 163:55 164:10 165:48 166:1 167:32 168:103 169:5 170:17 172:1 175:4 177:7 179:12 180:16 181:1 182:3 184:6 185:41 186:4 187:8 188:20 190:17 191:13 192:1216 193:246 194:108 195:51 196:148 197:342 198:531 199:235 200:312 201:6 202:386 203:359 204:271 205:167 206:168 207:241 208:37 209:146 210:210 211:15 212:135 213:4 216:86 217:22 218:21 219:2 220:16 222:4 223:17 End of report