[REN-BGP-stats-all] IPv4 R&E Routing Table Report - ASREN (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Sat Jun 21 17:05:35 UTC 2025
IPv4 R&E Routing Table Report 17:05 GMT Sat 21 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: 13344
Prefixes after maximum aggregation (per Origin AS): 7930
Deaggregation factor: 1.68
Unique aggregates announced (without unneeded subnets): 8624
Number of IPv4 prefixes with a valid ROA: 5631
Number of IPv4 prefixes with an invalid ROA: 1
Number of IPv4 prefixes with no ROA: 7712
Total ASes present in the Internet Routing Table: 2040
Prefixes per ASN: 6.54
Origin-only ASes present in the Internet Routing Table: 1766
Origin ASes announcing only one prefix: 822
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: 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: 46694
Number of 32-bit ASNs visible in the Routing Table: 508
Prefixes from 32-bit ASNs in the Routing Table: 1289
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: 159683968
Equivalent to 9 /8s, 132 /16s and 149 /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: 1507
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 3370
Total APNIC prefixes after maximum aggregation: 1700
APNIC Deaggregation factor: 1.98
Prefixes being announced from the APNIC address blocks: 3369
Unique aggregates announced from the APNIC address blocks: 1831
APNIC Region origin ASes present in the Internet Routing Table: 455
APNIC Prefixes per ASN: 7.40
APNIC Region origin ASes announcing only one prefix: 212
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: 202
Number of APNIC addresses announced to Internet: 37257280
Equivalent to 2 /8s, 56 /16s and 128 /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: 5673
Total ARIN prefixes after maximum aggregation: 3332
ARIN Deaggregation factor: 1.70
Prefixes being announced from the ARIN address blocks: 5720
Unique aggregates announced from the ARIN address blocks: 3742
ARIN Region origin ASes present in the Internet Routing Table: 885
ARIN Prefixes per ASN: 6.46
ARIN Region origin ASes announcing only one prefix: 312
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: 14
Number of ARIN region 32-bit ASNs visible in the Routing Table: 137
Number of ARIN addresses announced to Internet: 63524832
Equivalent to 3 /8s, 201 /16s and 79 /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: 3142
Total RIPE prefixes after maximum aggregation: 2592
RIPE Deaggregation factor: 1.21
Prefixes being announced from the RIPE address blocks: 3131
Unique aggregates announced from the RIPE address blocks: 2638
RIPE Region origin ASes present in the Internet Routing Table: 565
RIPE Prefixes per ASN: 5.54
RIPE Region origin ASes announcing only one prefix: 255
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: 133
Number of RIPE addresses announced to Internet: 56340096
Equivalent to 3 /8s, 91 /16s and 174 /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: 653
Total LACNIC prefixes after maximum aggregation: 246
LACNIC Deaggregation factor: 2.65
Prefixes being announced from the LACNIC address blocks: 649
Unique aggregates announced from the LACNIC address blocks: 326
LACNIC Region origin ASes present in the Internet Routing Table: 58
LACNIC Prefixes per ASN: 11.19
LACNIC Region origin ASes announcing only one prefix: 25
LACNIC Region transit ASes present in the Internet Routing Table: 16
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 8
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 18
Number of LACNIC addresses announced to Internet: 1860576
Equivalent to 0 /8s, 28 /16s and 99 /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: 474
Total AfriNIC prefixes after maximum aggregation: 56
AfriNIC Deaggregation factor: 8.46
Prefixes being announced from the AfriNIC address blocks: 473
Unique aggregates announced from the AfriNIC address blocks: 85
AfriNIC Region origin ASes present in the Internet Routing Table: 32
AfriNIC Prefixes per ASN: 14.78
AfriNIC Region origin ASes announcing only one prefix: 18
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: 18
Number of AfriNIC addresses announced to Internet: 698880
Equivalent to 0 /8s, 10 /16s and 170 /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 603 2170 464 SINET-AS Research Organization of Informa
7497 454 180 23 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
6262 51 133 45 CSIRO Commonwealth Scientific and Industr
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 200 16 1 UPRENET, PR
376 192 146 144 RISQ-AS, CA
2920 176 34 7 LACOE, US
2152 146 491 96 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 57 4 24 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 310 176 33 Rede Nacional de Ensino e Pesquisa, BR
11340 110 25 52 Red Universitaria Nacional, CL
2715 37 51 28 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
278 13 9 11 Universidad Nacional Autonoma de Mexico,
52888 12 7 7 UNIVERSIDADE FEDERAL DE SAO CARLOS, BR
61468 11 1 10 CEDIA, EC
21612 9 1 8 FUNDACAO INSTITUTO OSWALDO CRUZ, BR
28027 7 2 1 Escuela Superior Politecnica del Litoral,
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 333 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
37661 9 6 3 NRaE1-AS, NG
327947 5 2 3 KNUST-, GH
327798 4 0 3 BERNET, BI
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 603 2170 464 SINET-AS Research Organization of Informa
7497 454 180 23 CSTNET-AS-AP Computer Network Information
36914 333 82 3 KENET-AS, KE
1916 310 176 33 Rede Nacional de Ensino e Pesquisa, BR
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
5786 200 16 1 UPRENET, PR
786 194 1742 187 JANET Jisc Services Limited, GB
376 192 146 144 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 454 431 CSTNET-AS-AP Computer Network Information Cente
36914 333 330 KENET-AS, KE
1916 310 277 Rede Nacional de Ensino e Pesquisa, BR
5786 200 199 UPRENET, PR
58647 182 180 KAGAWAU-AS Kagawa University, JP
2920 176 169 LACOE, US
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 /15:96 /16:1586 /17:280 /18:313
/19:424 /20:585 /21:599 /22:1000 /23:1079 /24:7167
/25:52 /26:77 /27:29 /28:0 /29:0 /30:0
/31:0 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 315 333 KENET-AS, KE
1916 85 310 Rede Nacional de Ensino e Pesquisa, BR
23024 38 99 OCDE, US
200521 32 57 SEAP-AGE, ES
37215 31 37 MAREN, MW
25977 27 30 HCCS, US
32440 27 48 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 23:5
24:2 31:1 35:1 37:14 38:4 40:1
41:87 42:13 44:4 45:25 46:5 47:1
49:12 58:16 59:17 60:6 61:2 62:5
63:3 64:30 66:21 67:31 68:2 69:8
70:2 72:7 74:16 76:31 77:6 78:3
79:9 80:8 81:25 82:2 83:7 84:6
85:31 87:1 89:10 91:35 93:15 94:2
95:1 96:5 98:2 101:2 102:3 103:298
104:75 108:4 109:1 111:17 114:1 116:6
118:33 119:31 121:28 122:8 123:8 124:42
128:31 129:35 130:94 131:52 132:57 133:156
134:75 136:198 137:45 138:10 139:4 140:26
141:2 142:24 143:13 144:7 145:2 146:124
147:13 148:8 149:10 150:8 151:5 152:109
153:13 154:21 155:40 156:128 157:11 158:27
159:116 160:33 161:10 162:15 163:68 164:10
165:3 167:9 168:12 169:5 170:11 172:1
173:5 177:1 179:12 180:16 182:1 184:7
185:38 187:6 188:13 190:1 191:2 192:1156
193:251 194:85 195:67 196:11 197:266 198:329
199:194 200:176 201:2 202:342 203:189 204:321
205:93 206:158 207:191 208:46 209:91 210:109
211:2 212:43 213:4 216:50 217:22 219:7
222:3 223:6
End of report
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