[REN-BGP-stats-all] IPv4 R&E Routing Table Report - ASREN (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Sat May 31 17:05:39 UTC 2025
IPv4 R&E Routing Table Report 17:05 GMT Sat 31 May, 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: 13487
Prefixes after maximum aggregation (per Origin AS): 8093
Deaggregation factor: 1.67
Unique aggregates announced (without unneeded subnets): 8894
Number of IPv4 prefixes with a valid ROA: 5739
Number of IPv4 prefixes with an invalid ROA: 1
Number of IPv4 prefixes with no ROA: 7747
Total ASes present in the Internet Routing Table: 2060
Prefixes per ASN: 6.55
Origin-only ASes present in the Internet Routing Table: 1787
Origin ASes announcing only one prefix: 831
Transit ASes present in the Internet Routing Table: 273
Transit-only ASes present in the Internet Routing Table: 43
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: 46546
Number of 32-bit ASNs visible in the Routing Table: 510
Prefixes from 32-bit ASNs in the Routing Table: 1285
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: 162318560
Equivalent to 9 /8s, 172 /16s and 200 /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: 1522
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 3405
Total APNIC prefixes after maximum aggregation: 1715
APNIC Deaggregation factor: 1.99
Prefixes being announced from the APNIC address blocks: 3404
Unique aggregates announced from the APNIC address blocks: 1881
APNIC Region origin ASes present in the Internet Routing Table: 459
APNIC Prefixes per ASN: 7.42
APNIC Region origin ASes announcing only one prefix: 216
APNIC Region transit ASes present in the Internet Routing Table: 41
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: 37323584
Equivalent to 2 /8s, 57 /16s and 131 /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: 5774
Total ARIN prefixes after maximum aggregation: 3402
ARIN Deaggregation factor: 1.70
Prefixes being announced from the ARIN address blocks: 5823
Unique aggregates announced from the ARIN address blocks: 3818
ARIN Region origin ASes present in the Internet Routing Table: 900
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: 115
Average ARIN Region AS path length visible: 5.0
Max ARIN Region AS path length visible: 10
Number of ARIN region 32-bit ASNs visible in the Routing Table: 134
Number of ARIN addresses announced to Internet: 66343264
Equivalent to 3 /8s, 244 /16s and 81 /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: 3126
Total RIPE prefixes after maximum aggregation: 2593
RIPE Deaggregation factor: 1.21
Prefixes being announced from the RIPE address blocks: 3113
Unique aggregates announced from the RIPE address blocks: 2637
RIPE Region origin ASes present in the Internet Routing Table: 567
RIPE Prefixes per ASN: 5.49
RIPE Region origin ASes announcing only one prefix: 258
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: 13
Number of RIPE region 32-bit ASNs visible in the Routing Table: 134
Number of RIPE addresses announced to Internet: 56276608
Equivalent to 3 /8s, 90 /16s and 182 /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: 630
Total LACNIC prefixes after maximum aggregation: 326
LACNIC Deaggregation factor: 1.93
Prefixes being announced from the LACNIC address blocks: 626
Unique aggregates announced from the LACNIC address blocks: 476
LACNIC Region origin ASes present in the Internet Routing Table: 61
LACNIC Prefixes per ASN: 10.26
LACNIC Region origin ASes announcing only one prefix: 25
LACNIC Region transit ASes present in the Internet Routing Table: 14
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: 22
Number of LACNIC addresses announced to Internet: 1760192
Equivalent to 0 /8s, 26 /16s and 219 /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: 520
Total AfriNIC prefixes after maximum aggregation: 53
AfriNIC Deaggregation factor: 9.81
Prefixes being announced from the AfriNIC address blocks: 519
Unique aggregates announced from the AfriNIC address blocks: 80
AfriNIC Region origin ASes present in the Internet Routing Table: 29
AfriNIC Prefixes per ASN: 17.90
AfriNIC Region origin ASes announcing only one prefix: 15
AfriNIC Region transit ASes present in the Internet Routing Table: 7
Average AfriNIC Region AS path length visible: 5.8
Max AfriNIC Region AS path length visible: 9
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 16
Number of AfriNIC addresses announced to Internet: 612608
Equivalent to 0 /8s, 9 /16s and 89 /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 172 281 116 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
5786 199 16 1 UPRENET, PR
376 191 161 142 RISQ-AS, CA
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 97 7 21 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 95 1471 82 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 61 111 Rede Nacional de Ensino e Pesquisa, BR
11340 110 25 52 Red Universitaria Nacional, CL
2715 43 83 32 Fundacao Carlos Chagas Filho de Amparo a
20191 26 16 1 Pontificia Universidad Catolica de Chile,
28571 19 40 18 UNIVERSIDADE DE SAO PAULO, BR
52888 13 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR
61468 12 1 11 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
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 385 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 385 82 3 KENET-AS, KE
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
1916 261 61 111 Rede Nacional de Ensino e Pesquisa, BR
5786 199 16 1 UPRENET, PR
786 194 1742 187 JANET Jisc Services Limited, GB
376 191 161 142 RISQ-AS, CA
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 385 382 KENET-AS, KE
5786 199 198 UPRENET, PR
58647 182 180 KAGAWAU-AS Kagawa University, JP
2920 176 169 LACOE, US
1916 261 150 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
1736 79 78 MU-AS, 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 /16:1614 /17:296 /18:306
/19:445 /20:559 /21:593 /22:1010 /23:1079 /24:7270
/25:51 /26:78 /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 365 385 KENET-AS, KE
1916 85 261 Rede Nacional de Ensino e Pesquisa, BR
23024 38 97 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
41:115 42:13 44:4 45:25 46:5 47:1
49:12 58:16 59:17 60:6 61:2 62:5
63:3 64:31 66:19 67:31 68:2 69:8
70:2 72:7 74:16 76:30 77:6 78:3
79:9 80:8 81:11 82:2 83:7 84:6
85:31 87:1 89:10 91:36 93:15 94:2
95:2 96:5 98:2 101:2 102:3 103:300
104:73 108:4 109:1 111:17 114:1 116:6
118:34 119:31 121:28 122:8 123:8 124:42
128:33 129:34 130:95 131:53 132:54 133:156
134:75 136:198 137:47 138:10 139:4 140:26
141:2 142:24 143:14 144:25 145:2 146:122
147:14 148:9 149:12 150:11 151:5 152:109
153:14 154:22 155:55 156:128 157:11 158:27
159:116 160:34 161:12 162:17 163:61 164:10
165:2 167:7 168:12 169:6 170:12 172:1
173:5 177:1 179:10 180:16 182:1 184:7
185:36 187:7 188:13 190:1 191:2 192:1145
193:251 194:86 195:67 196:11 197:285 198:334
199:194 200:179 201:2 202:370 203:186 204:316
205:98 206:160 207:200 208:47 209:93 210:109
211:2 212:42 213:4 216:52 217:22 219:7
222:3 223:6
End of report
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