[REN-BGP-stats-all] IPv4 R&E Routing Table Report - ASREN (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Thu Jun 5 17:05:40 UTC 2025
IPv4 R&E Routing Table Report 17:05 GMT Thu 05 Jun, 2025
IPv4 BGP Table (R&E) as seen at ASREN.
Report Website: https://bgp.nsrc.org/REN
Detailed Analysis: https://bgp.nsrc.org/REN/ASREN/
Analysis Summary
----------------
BGP routing table entries examined: 13383
Prefixes after maximum aggregation (per Origin AS): 8061
Deaggregation factor: 1.66
Unique aggregates announced (without unneeded subnets): 8837
Number of IPv4 prefixes with a valid ROA: 5698
Number of IPv4 prefixes with an invalid ROA: 1
Number of IPv4 prefixes with no ROA: 7684
Total ASes present in the Internet Routing Table: 2060
Prefixes per ASN: 6.50
Origin-only ASes present in the Internet Routing Table: 1786
Origin ASes announcing only one prefix: 825
Transit ASes present in the Internet Routing Table: 274
Transit-only ASes present in the Internet Routing Table: 44
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 4.5
Max AS path length visible: 13
Max AS path prepend of ASN ( 43066) 9
Prefixes from unregistered ASNs in the Routing Table: 32
Number of instances of unregistered ASNs: 32
Number of 32-bit ASNs allocated by the RIRs: 46582
Number of 32-bit ASNs visible in the Routing Table: 509
Prefixes from 32-bit ASNs in the Routing Table: 1281
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: 161509280
Equivalent to 9 /8s, 160 /16s and 111 /24s
Percentage of available address space announced: 4.4
Percentage of allocated address space announced: 4.4
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: 1482
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 3383
Total APNIC prefixes after maximum aggregation: 1702
APNIC Deaggregation factor: 1.99
Prefixes being announced from the APNIC address blocks: 3382
Unique aggregates announced from the APNIC address blocks: 1858
APNIC Region origin ASes present in the Internet Routing Table: 457
APNIC Prefixes per ASN: 7.40
APNIC Region origin ASes announcing only one prefix: 213
APNIC Region transit ASes present in the Internet Routing Table: 42
Average APNIC Region AS path length visible: 4.1
Max APNIC Region AS path length visible: 13
Number of APNIC region 32-bit ASNs visible in the Routing Table: 203
Number of APNIC addresses announced to Internet: 37249088
Equivalent to 2 /8s, 56 /16s and 96 /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: 5794
Total ARIN prefixes after maximum aggregation: 3415
ARIN Deaggregation factor: 1.70
Prefixes being announced from the ARIN address blocks: 5842
Unique aggregates announced from the ARIN address blocks: 3827
ARIN Region origin ASes present in the Internet Routing Table: 903
ARIN Prefixes per ASN: 6.47
ARIN Region origin ASes announcing only one prefix: 317
ARIN Region transit ASes present in the Internet Routing Table: 114
Average ARIN Region AS path length visible: 5.0
Max ARIN Region AS path length visible: 12
Number of ARIN region 32-bit ASNs visible in the Routing Table: 135
Number of ARIN addresses announced to Internet: 65900640
Equivalent to 3 /8s, 237 /16s and 144 /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, 393216-402332
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: 3118
Total RIPE prefixes after maximum aggregation: 2589
RIPE Deaggregation factor: 1.20
Prefixes being announced from the RIPE address blocks: 3106
Unique aggregates announced from the RIPE address blocks: 2634
RIPE Region origin ASes present in the Internet Routing Table: 563
RIPE Prefixes per ASN: 5.52
RIPE Region origin ASes announcing only one prefix: 254
RIPE Region transit ASes present in the Internet Routing Table: 89
Average RIPE Region AS path length visible: 3.8
Max RIPE Region AS path length visible: 12
Number of RIPE region 32-bit ASNs visible in the Routing Table: 133
Number of RIPE addresses announced to Internet: 56274048
Equivalent to 3 /8s, 90 /16s and 172 /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: 591
Total LACNIC prefixes after maximum aggregation: 296
LACNIC Deaggregation factor: 2.00
Prefixes being announced from the LACNIC address blocks: 587
Unique aggregates announced from the LACNIC address blocks: 434
LACNIC Region origin ASes present in the Internet Routing Table: 61
LACNIC Prefixes per ASN: 9.62
LACNIC Region origin ASes announcing only one prefix: 24
LACNIC Region transit ASes present in the Internet Routing Table: 15
Average LACNIC Region AS path length visible: 4.5
Max LACNIC Region AS path length visible: 8
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 21
Number of LACNIC addresses announced to Internet: 1387904
Equivalent to 0 /8s, 21 /16s and 45 /24s
LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
61440-61951, 64099-64197, 262144-274844 + 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: 465
Total AfriNIC prefixes after maximum aggregation: 55
AfriNIC Deaggregation factor: 8.45
Prefixes being announced from the AfriNIC address blocks: 464
Unique aggregates announced from the AfriNIC address blocks: 82
AfriNIC Region origin ASes present in the Internet Routing Table: 31
AfriNIC Prefixes per ASN: 14.97
AfriNIC Region origin ASes announcing only one prefix: 17
AfriNIC Region transit ASes present in the Internet Routing Table: 7
Average AfriNIC Region AS path length visible: 5.9
Max AfriNIC Region AS path length visible: 9
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 17
Number of AfriNIC addresses announced to Internet: 695296
Equivalent to 0 /8s, 10 /16s and 156 /24s
AfriNIC AS Blocks 36864-37887, 327680-329727 & 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 601 2170 465 SINET-AS Research Organization of Informa
7497 456 180 24 CSTNET-AS-AP Computer Network Information
4538 190 4192 71 ERX-CERNET-BKB China Education and Resear
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
7575 173 281 117 AARNET-AS-AP Australian Academic and Rese
55824 148 19 21 NKN-CORE-NW NKN Core Network, IN
2697 58 4 34 ERX-ERNET-AS Education and Research Netwo
38280 50 3 2 MONASHUNI-MY-AS-AP Monash University Sunw
45773 48 3 5 HECPERN-AS-PK PERN AS Content Servie Prov
132524 42 9 10 TIFR-AS Tata Institute of Fundamental Res
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-APNIC
ARIN Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
376 199 162 149 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
2920 176 34 7 LACOE, US
2152 147 507 97 CENIC-2152, US
18558 139 18 4 NETBLK-RCOEK, US
81 100 367 27 NCREN, US
23024 99 7 17 OCDE, US
21976 88 34 14 NJEDGE-NET, US
1736 79 16 1 MU-AS, US
22742 67 37 32 CT-EDU-NET, US
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-ARIN
RIPE Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
786 194 1742 187 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
1103 96 1487 83 SURFNET-NL SURFnet, The Netherlands, NL
2614 92 26 69 ROEDUNET, RO
137 82 677 77 ASGARR Consortium GARR, IT
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
553 75 366 75 BELWUE BelWue-Koordination, DE
2200 63 614 58 FR-RENATER Reseau National de telecommuni
200521 56 4 23 SEAP-AGE, ES
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-RIPE
LACNIC Region per AS prefix count summary
-----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
1916 261 61 112 Rede Nacional de Ensino e Pesquisa, BR
11340 110 25 52 Red Universitaria Nacional, CL
20191 26 16 1 Pontificia Universidad Catolica de Chile,
28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR
52888 14 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR
61468 11 1 10 CEDIA, EC
278 10 9 8 Universidad Nacional Autonoma de Mexico,
10715 9 18 3 Universidade Federal de Santa Catarina, B
21612 9 1 8 FUNDACAO INSTITUTO OSWALDO CRUZ, BR
262742 8 2 1 Fundacao Universidade Federal do ABC - UF
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-LACNIC
AfriNIC Region per AS prefix count summary
------------------------------------------
ASN No of nets /20 equiv MaxAgg Description
36914 328 82 3 KENET-AS, KE
37215 36 8 1 MAREN, MW
6879 24 2 9 ENSTINET-, EG
30983 12 4 2 MARWAN-AS, MA
327700 11 16 1 MoRENet, MZ
37654 10 1 6 RwEdNet-AS, RW
37661 9 6 3 NRaE1-AS, NG
327798 4 0 3 BERNET, BI
327947 3 1 3 KNUST-, GH
327992 3 1 2 GHANAIAN-ACADEMIC-AND-RESEARCH-NETWORK, G
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet-AFRINIC
Global Per AS prefix count summary
----------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 601 2170 465 SINET-AS Research Organization of Informa
7497 456 180 24 CSTNET-AS-AP Computer Network Information
36914 328 82 3 KENET-AS, KE
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
1916 261 61 112 Rede Nacional de Ensino e Pesquisa, BR
376 199 162 149 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
786 194 1742 187 JANET Jisc Services Limited, GB
4538 190 4192 71 ERX-CERNET-BKB China Education and Resear
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-ASnet
Global Per AS Maximum Aggregation summary
-----------------------------------------
ASN No of nets Net Savings Description
7497 456 432 CSTNET-AS-AP Computer Network Information Cente
36914 328 325 KENET-AS, KE
5786 199 198 UPRENET, PR
58647 182 180 KAGAWAU-AS Kagawa University, JP
2920 176 169 LACOE, US
1916 261 149 Rede Nacional de Ensino e Pesquisa, BR
18558 139 135 NETBLK-RCOEK, US
55824 148 127 NKN-CORE-NW NKN Core Network, IN
4538 190 119 ERX-CERNET-BKB China Education and Research Net
23024 99 82 OCDE, US
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-CIDRnet
List of Unregistered Origin ASNs (Global)
-----------------------------------------
Bad AS Designation Net Originated Transit AS Transit AS Name
26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.81.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.82.0/24 3112 OARNET-AS-1, US
Complete listing at https://bgp.nsrc.org/REN/ASREN/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
203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University
203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res
Complete listing at https://bgp.nsrc.org/REN/ASREN/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 /12:9
/13:16 /14:30 /15:99 /16:1600 /17:293 /18:302
/19:447 /20:558 /21:591 /22:1016 /23:1094 /24:7168
/25:51 /26:77 /27:30 /28:0 /29:0 /30:0
/31:0 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 310 328 KENET-AS, KE
1916 84 261 Rede Nacional de Ensino e Pesquisa, BR
23024 38 99 OCDE, US
200521 31 56 SEAP-AGE, ES
37215 30 36 MAREN, MW
32440 28 51 LONI, US
25977 27 30 HCCS, US
26898 24 64 RESERVED, ZZ
36794 24 26 META SOLUTIONS PIKETON, US
60187 23 48 LGFL-AS, GB
Complete listing at https://bgp.nsrc.org/REN/ASREN/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:1 5:16 8:2 12:1 14:93 23:4
24:2 31:1 35:1 37:9 38:4 40:1
41:91 42:13 44:4 45:24 46:5 47:1
49:12 58:16 59:17 60:6 61:2 62:5
63:3 64:30 66:19 67:31 68:2 69:10
70:2 72:7 74:17 76:30 77:6 78:3
79:9 80:8 81:9 82:2 83:7 84:6
85:31 87:1 89:10 91:36 93:15 94:2
95:1 96:5 98:2 101:2 102:3 103:299
104:75 108:4 109:1 111:17 114:1 116:6
118:34 119:31 121:28 122:8 123:8 124:42
128:31 129:34 130:95 131:56 132:54 133:156
134:75 136:198 137:47 138:10 139:4 140:26
141:2 142:24 143:11 144:32 145:2 146:123
147:14 148:9 149:12 150:11 151:5 152:78
153:13 154:21 155:38 156:128 157:11 158:27
159:116 160:34 161:12 162:15 163:61 164:10
165:3 167:7 168:12 169:6 170:12 172:1
173:5 177:1 179:10 180:16 182:1 184:7
185:36 187:5 188:13 190:2 191:2 192:1138
193:251 194:85 195:67 196:11 197:255 198:339
199:195 200:176 201:2 202:372 203:186 204:319
205:98 206:160 207:199 208:46 209:94 210:109
211:2 212:42 213:4 216:52 217:22 219:7
222:3 223:6
End of report
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