Country
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ASN LANDING PAGE
AS5400
BT British Telecommunications Limited
Last updated · Jul 20, 2026
Total prefixes
126
IPv4 prefixes
86
IPv6 prefixes
40
ASN summary
How to read the scale of AS5400
BT British Telecommunications Limited currently reports 126 prefixes and 80 upstream, downstream, or peer relationships. These counts describe the current dataset; they do not by themselves prove network quality, reach, or service use.
What can an ASN page answer?
An ASN page shows the public organization label, country or region, BGP prefixes, and available peer and upstream relationships. It adds network context but cannot confirm a website host, physical facility, security status, or service quality.
How should you read the organization and region fields?
BT British Telecommunications Limited is currently associated with an unknown region. These values come from public network sources and are useful lookup clues; an organization label, registration region, and actual service location may differ.
How should you verify the AS5400 result?
The page shows ASN data returned by the current upstream query; interpret it with the update time. Open representative IP pages from the same network and compare prefixes, source labels, and query times. Verify operator or service claims with the relevant registry or network operator.
How to verify this ASN result
AS5400 ASN lookupAS5400 BGPAS5400 peersAS5400 prefixesAS5400 upstreamsBT British Telecommunications Limited ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
AS2856
AS2856
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AS2110
AS2110
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AS8968
AS8968
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AS199541
AS199541
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AS202666
AS202666
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AS29063
AS29063
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AS7246
AS7246
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AS40126
AS40126
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AS51046
AS51046
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AS21489
AS21489
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AS21000
AS21000
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AS3573
AS3573
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AS59724
AS59724
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AS33873
AS33873
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AS22683
AS22683
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AS25049
AS25049
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AS12298
AS12298
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AS13205
AS13205
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AS27311
AS27311
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AS34311
AS34311
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AS51466
AS51466
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AS208053
AS208053
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AS30864
AS30864
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AS48647
AS48647
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AS212565
AS212565
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AS72
AS72
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AS7734
AS7734
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AS394805
AS394805
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AS21433
AS21433
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AS12734
AS12734
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AS10780
AS10780
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AS202097
AS202097
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AS203990
AS203990
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AS51527
AS51527
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AS43033
AS43033
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AS206625
AS206625
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AS15442
AS15442
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AS13130
AS13130
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AS15518
AS15518
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AS12257
AS12257
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Peers
AS1299
AS1299
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AS3356
AS3356
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AS174
AS174
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AS6939
AS6939
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AS6762
AS6762
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AS3257
AS3257
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AS3491
AS3491
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AS6453
AS6453
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AS9002
AS9002
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AS12956
AS12956
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AS3320
AS3320
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AS4637
AS4637
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AS2856
AS2856
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AS33891
AS33891
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AS39351
AS39351
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AS13030
AS13030
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AS2497
AS2497
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AS24961
AS24961
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AS20485
AS20485
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AS5511
AS5511
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AS50304
AS50304
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AS8283
AS8283
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AS35280
AS35280
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AS6830
AS6830
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AS8218
AS8218
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AS199524
AS199524
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AS6881
AS6881
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AS52320
AS52320
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AS19151
AS19151
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AS37468
AS37468
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AS14907
AS14907
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AS31027
AS31027
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AS1836
AS1836
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AS45489
AS45489
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AS6730
AS6730
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AS30781
AS30781
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AS9121
AS9121
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AS680
AS680
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AS1853
AS1853
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AS21320
AS21320
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Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 132.244.240.0/24 | AS5400 | — |
| 132.244.64.0/21 | AS5400 | — |
| 132.244.72.0/21 | AS5400 | — |
| 136.238.224.0/24 | AS5400 | — |
| 136.238.84.0/24 | AS5400 | — |
| 136.238.85.0/24 | AS5400 | — |
| 166.49.128.0/17 | AS5400 | — |
| 185.249.4.0/24 | AS5400 | — |
| 185.94.0.0/22 | AS5400 | — |
| 192.109.52.0/24 | AS5400 | — |
| 193.58.130.0/23 | AS5400 | — |
| 194.107.114.0/24 | AS5400 | — |
| 194.213.64.0/19 | AS5400 | — |
| 194.33.53.0/24 | AS5400 | — |
| 194.33.54.0/24 | AS5400 | — |
| 194.33.55.0/24 | AS5400 | — |
| 194.50.160.0/24 | AS5400 | — |
| 194.74.80.0/21 | AS5400 | — |
| 194.76.40.0/24 | AS5400 | — |
| 195.100.0.0/16 | AS5400 | — |
| 195.163.0.0/16 | AS5400 | — |
| 195.171.36.0/22 | AS5400 | — |
| 195.182.96.0/19 | AS5400 | — |
| 195.36.104.0/24 | AS5400 | — |
| 195.36.82.0/24 | AS5400 | — |
| 195.60.182.0/24 | AS5400 | — |
| 195.60.183.0/24 | AS5400 | — |
| 195.66.70.0/24 | AS5400 | — |
| 195.90.64.0/19 | AS5400 | — |
| 195.99.64.0/20 | AS5400 | — |
| 198.178.236.0/24 | AS5400 | — |
| 2001:740::/32 | AS5400 | — |
| 203.158.68.0/23 | AS5400 | — |
| 203.158.72.0/23 | AS5400 | — |
| 203.158.76.0/23 | AS5400 | — |
| 203.158.88.0/24 | AS5400 | — |
| 203.158.89.0/24 | AS5400 | — |
| 204.231.112.0/24 | AS5400 | — |
| 204.52.188.0/24 | AS5400 | — |
| 206.73.0.0/16 | AS5400 | — |
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Related lookups and next steps
Frequently asked questions about this ASN page
What does AS5400 represent?
AS5400 is an autonomous system number. The current source associates it with BT British Telecommunications Limited and the region field an unknown region; those values add network context but do not prove a specific service, physical location, or quality level.
What are peers, upstreams, and prefixes useful for on the AS5400 page?
They help explain the scale, interconnection depth, and route structure of AS5400. Richer peering and upstream data often indicate broader network reach, but they should still be interpreted together with prefixes and related IP landing pages.
What should you do after reviewing AS5400?
Open a concrete IP page to check how the address maps into AS5400, then compare the prefix, source labels, and query time. Verify operator or service claims with the relevant registry or network operator.
Related topics
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