[REN-BGP-stats-all] IPv4 R&E Routing Table Report - ASREN (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Thu Jul 31 17:05:35 UTC 2025
IPv4 R&E Routing Table Report 17:05 GMT Thu 31 Jul, 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: 13689
Prefixes after maximum aggregation (per Origin AS): 8024
Deaggregation factor: 1.71
Unique aggregates announced (without unneeded subnets): 8739
Number of IPv4 prefixes with a valid ROA: 5924
Number of IPv4 prefixes with an invalid ROA: 1
Number of IPv4 prefixes with no ROA: 7764
Total ASes present in the Internet Routing Table: 2041
Prefixes per ASN: 6.71
Origin-only ASes present in the Internet Routing Table: 1767
Origin ASes announcing only one prefix: 819
Transit ASes present in the Internet Routing Table: 274
Transit-only ASes present in the Internet Routing Table: 42
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: 14
Max AS path prepend of ASN ( 30116) 10
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: 46997
Number of 32-bit ASNs visible in the Routing Table: 508
Prefixes from 32-bit ASNs in the Routing Table: 1296
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: 161490752
Equivalent to 9 /8s, 160 /16s and 39 /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: 1700
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 3460
Total APNIC prefixes after maximum aggregation: 1757
APNIC Deaggregation factor: 1.97
Prefixes being announced from the APNIC address blocks: 3459
Unique aggregates announced from the APNIC address blocks: 1919
APNIC Region origin ASes present in the Internet Routing Table: 454
APNIC Prefixes per ASN: 7.62
APNIC Region origin ASes announcing only one prefix: 211
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: 204
Number of APNIC addresses announced to Internet: 37671776
Equivalent to 2 /8s, 62 /16s and 211 /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: 5763
Total ARIN prefixes after maximum aggregation: 3377
ARIN Deaggregation factor: 1.71
Prefixes being announced from the ARIN address blocks: 5811
Unique aggregates announced from the ARIN address blocks: 3781
ARIN Region origin ASes present in the Internet Routing Table: 898
ARIN Prefixes per ASN: 6.47
ARIN Region origin ASes announcing only one prefix: 318
ARIN Region transit ASes present in the Internet Routing Table: 118
Average ARIN Region AS path length visible: 5.0
Max ARIN Region AS path length visible: 14
Number of ARIN region 32-bit ASNs visible in the Routing Table: 142
Number of ARIN addresses announced to Internet: 64799872
Equivalent to 3 /8s, 220 /16s and 196 /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: 3154
Total RIPE prefixes after maximum aggregation: 2600
RIPE Deaggregation factor: 1.21
Prefixes being announced from the RIPE address blocks: 3142
Unique aggregates announced from the RIPE address blocks: 2645
RIPE Region origin ASes present in the Internet Routing Table: 569
RIPE Prefixes per ASN: 5.52
RIPE Region origin ASes announcing only one prefix: 258
RIPE Region transit ASes present in the Internet Routing Table: 88
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: 136
Number of RIPE addresses announced to Internet: 56385408
Equivalent to 3 /8s, 92 /16s and 95 /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: 656
Total LACNIC prefixes after maximum aggregation: 246
LACNIC Deaggregation factor: 2.67
Prefixes being announced from the LACNIC address blocks: 652
Unique aggregates announced from the LACNIC address blocks: 323
LACNIC Region origin ASes present in the Internet Routing Table: 57
LACNIC Prefixes per ASN: 11.44
LACNIC Region origin ASes announcing only one prefix: 22
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: 19
Number of LACNIC addresses announced to Internet: 2034912
Equivalent to 0 /8s, 31 /16s and 12 /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: 624
Total AfriNIC prefixes after maximum aggregation: 40
AfriNIC Deaggregation factor: 15.60
Prefixes being announced from the AfriNIC address blocks: 623
Unique aggregates announced from the AfriNIC address blocks: 69
AfriNIC Region origin ASes present in the Internet Routing Table: 20
AfriNIC Prefixes per ASN: 31.15
AfriNIC Region origin ASes announcing only one prefix: 10
AfriNIC Region transit ASes present in the Internet Routing Table: 5
Average AfriNIC Region AS path length visible: 5.7
Max AfriNIC Region AS path length visible: 9
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 7
Number of AfriNIC addresses announced to Internet: 596480
Equivalent to 0 /8s, 9 /16s and 26 /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 607 2169 462 SINET-AS Research Organization of Informa
7497 453 180 23 CSTNET-AS-AP Computer Network Information
4538 189 4192 71 ERX-CERNET-BKB China Education and Resear
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
7575 170 281 115 AARNET-AS-AP Australian Academic and Rese
55824 149 19 21 NKN-CORE-NW NKN Core Network, IN
6262 63 134 56 CSIRO Commonwealth Scientific and Industr
2697 57 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
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
376 200 162 150 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
2920 179 34 7 LACOE, US
2152 148 491 97 CENIC-2152, US
18558 139 18 4 NETBLK-RCOEK, US
81 101 339 32 NCREN, US
23024 99 7 17 OCDE, US
21976 88 34 14 NJEDGE-NET, US
1736 78 16 1 MU-AS, US
22742 68 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
680 288 1899 250 DFN Verein zur Foerderung eines Deutschen
786 193 1742 187 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
1103 97 1503 84 SURFNET-NL SURFnet, The Netherlands, NL
2614 92 26 69 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 63 614 58 FR-RENATER Reseau National de telecommuni
200521 58 4 27 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 291 172 32 Rede Nacional de Ensino e Pesquisa, BR
11340 110 25 52 Red Universitaria Nacional, CL
2715 46 83 34 Fundacao Carlos Chagas Filho de Amparo a
20191 26 16 1 Pontificia Universidad Catolica de Chile,
21612 23 16 1 FUNDACAO INSTITUTO OSWALDO CRUZ, BR
28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR
61468 15 1 11 CEDIA, EC
52888 12 7 6 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR
278 11 1 10 Universidad Nacional Autonoma de Mexico,
2716 9 26 8 Universidade Federal do Rio Grande do Sul
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 507 82 3 KENET-AS, KE
37215 37 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
327798 4 0 3 BERNET, BI
328903 4 0 1 RITER, CI
37661 3 6 3 NRaE1-AS, NG
37182 2 8 1 TERNET, TZ
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 607 2169 462 SINET-AS Research Organization of Informa
36914 507 82 3 KENET-AS, KE
7497 453 180 23 CSTNET-AS-AP Computer Network Information
1916 291 172 32 Rede Nacional de Ensino e Pesquisa, BR
680 288 1899 250 DFN Verein zur Foerderung eines Deutschen
376 200 162 150 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
786 193 1742 187 JANET Jisc Services Limited, GB
4538 189 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
36914 507 504 KENET-AS, KE
7497 453 430 CSTNET-AS-AP Computer Network Information Cente
1916 291 259 Rede Nacional de Ensino e Pesquisa, BR
5786 199 198 UPRENET, PR
58647 182 180 KAGAWAU-AS Kagawa University, JP
2920 179 172 LACOE, US
18558 139 135 NETBLK-RCOEK, US
55824 149 128 NKN-CORE-NW NKN Core Network, IN
4538 189 118 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
/13:15 /14:30 /15:97 /16:1610 /17:280 /18:321
/19:430 /20:595 /21:615 /22:996 /23:1109 /24:7395
/25:56 /26:81 /27:48 /28:0 /29:0 /30:0
/31:0 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 483 507 KENET-AS, KE
1916 88 291 Rede Nacional de Ensino e Pesquisa, BR
23024 38 99 OCDE, US
200521 33 58 SEAP-AGE, ES
37215 31 37 MAREN, MW
25977 27 30 HCCS, US
32440 27 39 LONI, 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 23:3
24:2 31:1 35:1 37:14 38:3 40:1
41:170 42:13 44:4 45:24 46:5 47:1
49:12 58:15 59:17 60:6 62:5 63:3
64:30 66:19 67:32 68:2 69:9 70:2
72:7 74:16 76:22 77:6 78:3 79:9
80:8 81:26 82:2 83:7 84:6 85:31
87:1 89:10 91:35 93:15 94:2 95:1
96:5 98:2 101:2 102:4 103:288 104:72
108:5 109:1 111:17 114:1 118:33 119:31
121:28 122:8 123:8 124:42 128:35 129:36
130:94 131:53 132:56 133:156 134:77 136:198
137:44 138:11 139:4 140:25 141:2 142:21
143:12 144:22 145:4 146:123 147:14 148:9
149:10 150:8 151:4 152:108 153:13 154:14
155:39 156:129 157:20 158:26 159:116 160:34
161:10 162:15 163:73 164:8 165:3 167:7
168:35 169:5 170:6 173:5 175:4 177:2
179:5 180:16 182:1 184:6 185:39 187:5
188:14 190:2 191:2 192:1168 193:249 194:86
195:67 196:8 197:346 198:332 199:189 200:178
201:6 202:382 203:184 204:314 205:93 206:161
207:198 208:48 209:100 210:103 211:2 212:43
213:4 216:53 217:22 219:7 220:3 222:3
223:5
End of report
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