IPv4 R&E Routing Table Report 20:30 GMT Mon 18 May, 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: 16243 Prefixes after maximum aggregation (per Origin AS): 9197 Deaggregation factor: 1.77 Unique aggregates announced (without unneeded subnets): 10460 Number of IPv4 prefixes with a valid ROA: 7662 Number of IPv4 prefixes with an invalid ROA: 204 Number of IPv4 prefixes with no ROA: 8377 Total ASes present in the Internet Routing Table: 2395 Prefixes per ASN: 6.78 Origin-only ASes present in the Internet Routing Table: 2048 Origin ASes announcing only one prefix: 926 Transit ASes present in the Internet Routing Table: 347 Transit-only ASes present in the Internet Routing Table: 70 Paths with bogon ASNs present in the IPv4 Routing Table: 0 Average AS path length visible in the Internet Routing Table: 7.3 Max AS path length visible: 20 Max AS path prepend of ASN (395156) 12 Prefixes from unregistered ASNs in the Routing Table: 2 Number of instances of unregistered ASNs: 2 Number of 32-bit ASNs allocated by the RIRs: 49790 Number of 32-bit ASNs visible in the Routing Table: 637 Prefixes from 32-bit ASNs in the Routing Table: 1806 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: 2 Number of addresses announced to Internet: 145645056 Equivalent to 8 /8s, 174 /16s and 94 /24s Percentage of available address space announced: 3.9 Percentage of allocated address space announced: 3.9 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: 2005 APNIC Region Analysis Summary ----------------------------- Prefixes being announced by APNIC Region ASes: 3480 Total APNIC prefixes after maximum aggregation: 1609 APNIC Deaggregation factor: 2.16 Prefixes being announced from the APNIC address blocks: 3480 Unique aggregates announced from the APNIC address blocks: 1745 APNIC Region origin ASes present in the Internet Routing Table: 431 APNIC Prefixes per ASN: 8.07 APNIC Region origin ASes announcing only one prefix: 184 APNIC Region transit ASes present in the Internet Routing Table: 47 Average APNIC Region AS path length visible: 5.5 Max APNIC Region AS path length visible: 12 Number of APNIC region 32-bit ASNs visible in the Routing Table: 206 Number of APNIC addresses announced to Internet: 26098688 Equivalent to 1 /8s, 142 /16s and 60 /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: 7081 Total ARIN prefixes after maximum aggregation: 4331 ARIN Deaggregation factor: 1.63 Prefixes being announced from the ARIN address blocks: 7093 Unique aggregates announced from the ARIN address blocks: 5164 ARIN Region origin ASes present in the Internet Routing Table: 1152 ARIN Prefixes per ASN: 6.16 ARIN Region origin ASes announcing only one prefix: 416 ARIN Region transit ASes present in the Internet Routing Table: 151 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: 210 Number of ARIN addresses announced to Internet: 64283136 Equivalent to 3 /8s, 212 /16s and 226 /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: 3238 Total RIPE prefixes after maximum aggregation: 2581 RIPE Deaggregation factor: 1.25 Prefixes being announced from the RIPE address blocks: 3227 Unique aggregates announced from the RIPE address blocks: 2622 RIPE Region origin ASes present in the Internet Routing Table: 574 RIPE Prefixes per ASN: 5.62 RIPE Region origin ASes announcing only one prefix: 257 RIPE Region transit ASes present in the Internet Routing Table: 101 Average RIPE Region AS path length visible: 5.9 Max RIPE Region AS path length visible: 15 Number of RIPE region 32-bit ASNs visible in the Routing Table: 145 Number of RIPE addresses announced to Internet: 48914432 Equivalent to 2 /8s, 234 /16s and 96 /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: 476 LACNIC Deaggregation factor: 2.58 Prefixes being announced from the LACNIC address blocks: 1229 Unique aggregates announced from the LACNIC address blocks: 651 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: 55 Number of LACNIC addresses announced to Internet: 3918336 Equivalent to 0 /8s, 59 /16s and 202 /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: 1212 Total AfriNIC prefixes after maximum aggregation: 198 AfriNIC Deaggregation factor: 6.12 Prefixes being announced from the AfriNIC address blocks: 1212 Unique aggregates announced from the AfriNIC address blocks: 276 AfriNIC Region origin ASes present in the Internet Routing Table: 41 AfriNIC Prefixes per ASN: 29.56 AfriNIC Region origin ASes announcing only one prefix: 19 AfriNIC Region transit ASes present in the Internet Routing Table: 10 Average AfriNIC Region AS path length visible: 7.1 Max AfriNIC Region AS path length visible: 13 Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 21 Number of AfriNIC addresses announced to Internet: 2429952 Equivalent to 0 /8s, 37 /16s and 20 /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 464 212 24 CSTNET-AS-AP Computer Network Information 1237 199 72 154 KREONET-AS-KR KISTI, KR 1659 196 174 155 ERX-TANET-ASN1 Taiwan Academic Network TA 4538 181 4191 71 ERX-CERNET-BKB China Education and Resear 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 4621 58 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 543 59 305 CENIC-2152 - CENIC, US 5786 197 16 1 UPRENET - University of Puerto Rico, PR 376 196 146 150 RISQ-AS - Reseau dInformations Scientifiq 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 78 63 41 NOAA-NWAVE - National Oceanic and Atmosph 22742 69 37 31 CT-EDU-NET - Connecticut Education Networ 271 68 26 53 BCNET-AS - BCNET, CA 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 786 211 1699 192 JANET Jisc Services Limited, GB 559 115 533 105 SWITCH Switch, Swiss Academic and Researc 8895 98 24 5 ISU Internet Services Unit ISU, SA 2614 88 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 200521 58 4 24 SEAP-AGE, ES 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 217 161 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 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 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 558 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 327700 13 16 1 MoRENet, MZ 37501 11 49 6 UOFS, ZA 37182 10 8 1 TERNET, TZ 36982 8 33 8 UCT, 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 36914 558 82 3 KENET-AS, KE 2152 543 59 305 CENIC-2152 - CENIC, US 7497 464 212 24 CSTNET-AS-AP Computer Network Information 2018 374 318 69 TENET-1, ZA 680 291 1883 253 DFN Verein zur Foerderung eines Deutschen 1916 217 161 40 Rede Nacional de Ensino e Pesquisa, BR 786 211 1699 192 JANET Jisc Services Limited, GB 1237 199 72 154 KREONET-AS-KR KISTI, KR 5786 197 16 1 UPRENET - University of Puerto Rico, PR 376 196 146 150 RISQ-AS - Reseau dInformations Scientifiq Complete listing at https://bgp.nsrc.org/REN/PREGINET/data-ASnet Global Per AS Maximum Aggregation summary ----------------------------------------- ASN No of nets Net Savings Description 7497 464 440 CSTNET-AS-AP Computer Network Information Cente 2018 374 305 TENET-1, ZA 2152 543 238 CENIC-2152 - CENIC, US 5786 197 196 UPRENET - University of Puerto Rico, PR 1916 217 177 Rede Nacional de Ensino e Pesquisa, BR 55824 152 132 NKN-CORE-NW NKN Core Network, IN 4538 181 110 ERX-CERNET-BKB China Education and Research Net 8895 98 93 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 Complete listing at https://bgp.nsrc.org/REN/PREGINET/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 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 /11:0 /12:7 /13:15 /14:30 /15:100 /16:1546 /17:345 /18:384 /19:513 /20:700 /21:747 /22:1218 /23:1377 /24:9260 /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 534 558 KENET-AS, KE 8895 95 98 ISU Internet Services Unit ISU, SA 2152 77 543 CENIC-2152 - CENIC, US 31638 48 48 ASN-LEPIDA, IT 37215 39 45 MAREN, MW 200521 34 58 SEAP-AGE, ES 46115 32 35 LUTHER - Luther College, US 25977 30 44 HCCS - HOUSTON COMMUNITY COLLEGE SYSTEM, US 40326 29 33 ECKERD-COLLEGE - Eckerd College, US 61468 25 51 CEDIA, EC Complete listing at https://bgp.nsrc.org/REN/PREGINET/data-sXXas-nos Number of /24s announced per /8 block (Global) ---------------------------------------------- 1:2 5:19 8:13 12:2 14:96 23:10 24:2 31:1 35:3 37:25 38:10 40:1 41:235 42:16 44:4 45:36 46:4 49:9 50:4 58:13 59:20 60:6 61:3 62:6 63:5 64:40 65:8 66:40 67:39 68:7 69:8 70:3 72:4 74:57 76:25 77:4 78:3 79:5 80:6 81:27 82:3 83:7 84:5 85:26 86:4 87:1 89:17 91:35 93:14 94:2 95:2 96:5 97:1 98:3 101:5 102:6 103:269 104:44 108:9 109:12 111:3 113:2 114:24 116:9 117:5 118:33 119:35 121:17 122:8 123:8 124:42 125:3 128:34 129:47 130:91 131:66 132:62 133:13 134:102 136:197 137:99 138:3 139:5 140:84 141:7 142:32 143:23 144:8 145:13 146:134 147:62 148:233 149:11 150:31 151:9 152:122 153:14 154:38 155:84 156:11 157:25 158:28 159:111 160:6 161:33 162:23 163:32 164:7 165:47 166:1 167:33 168:103 169:2 170:16 172:1 173:1 175:4 177:6 179:12 180:16 181:1 182:3 184:2 185:41 186:4 187:8 188:22 190:17 191:13 192:1234 193:304 194:111 195:97 196:149 197:347 198:515 199:209 200:309 201:6 202:371 203:356 204:256 205:166 206:164 207:228 208:39 209:133 210:218 211:15 212:135 213:4 216:79 217:22 218:21 219:2 220:16 222:4 223:17 End of report