Country
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ASN LANDING PAGE
AS2856
BT-UK-AS - British Telecommunications PLC
Last updated · Apr 4, 2026
Total prefixes
431
IPv4 prefixes
424
IPv6 prefixes
7
ASN summary
How to read the scale of AS2856
BT-UK-AS - British Telecommunications PLC currently shows 431 prefixes and 80 upstream, downstream, or peer relationships. Larger prefix inventories often indicate broader network footprint, but they should still be read together with country and peering context.
When is an ASN page most useful?
ASN landing pages are more useful than a single IP page when you want cloud provider attribution, routing research, infrastructure comparison, or network topology analysis at the organization level.
How should you read the country, organization, and role of AS2856?
BT-UK-AS - British Telecommunications PLC is currently associated with an unknown region. Country data is only a starting point; the more important signals are the organization name, website, prefix volume, and peering relationships that reveal whether the network behaves like a cloud platform, ISP, CDN, or enterprise backbone.
What should you inspect next after the AS2856 page?
This page is currently showing live ASN data that can be used for peer, prefix, and network scale analysis. The most useful next step is usually to return to a related IP landing page, then compare that concrete address with this ASN profile and with broader topic pages for routing, cloud attribution, or WHOIS ownership analysis.
Search intents this ASN page helps cover
AS2856 ASN lookupAS2856 BGPAS2856 peersAS2856 prefixesAS2856 upstreamsBT-UK-AS - British Telecommunications PLC ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
AS39550
AS39550
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AS33981
AS33981
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AS205114
AS205114
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AS14766
AS14766
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AS6871
AS6871
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AS197409
AS197409
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AS19812
AS19812
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AS204819
AS204819
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AS212329
AS212329
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AS57002
AS57002
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AS54113
AS54113
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AS394731
AS394731
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AS15248
AS15248
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AS206051
AS206051
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AS201536
AS201536
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AS204550
AS204550
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AS211077
AS211077
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AS9011
AS9011
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AS206237
AS206237
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AS19428
AS19428
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AS3573
AS3573
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AS36224
AS36224
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AS33127
AS33127
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AS60962
AS60962
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AS29033
AS29033
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AS199675
AS199675
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AS15141
AS15141
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AS11939
AS11939
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AS39552
AS39552
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AS14931
AS14931
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AS49318
AS49318
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AS212565
AS212565
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AS28863
AS28863
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AS48549
AS48549
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AS209761
AS209761
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AS2134
AS2134
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AS25049
AS25049
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AS16525
AS16525
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AS17903
AS17903
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AS22775
AS22775
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Peers
AS5400
AS5400
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AS9002
AS9002
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AS14630
AS14630
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AS6461
AS6461
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AS13030
AS13030
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AS3303
AS3303
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AS5405
AS5405
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AS50304
AS50304
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AS60068
AS60068
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AS137409
AS137409
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AS4455
AS4455
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AS6424
AS6424
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AS51185
AS51185
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AS48185
AS48185
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AS35266
AS35266
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AS48070
AS48070
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AS6908
AS6908
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AS39122
AS39122
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AS199524
AS199524
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AS1828
AS1828
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AS6204
AS6204
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AS8220
AS8220
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AS42473
AS42473
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AS3170
AS3170
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AS6667
AS6667
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AS50300
AS50300
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AS17639
AS17639
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AS1267
AS1267
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AS13237
AS13237
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AS36236
AS36236
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AS49544
AS49544
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AS30844
AS30844
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AS9009
AS9009
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AS8426
AS8426
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AS9505
AS9505
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AS56595
AS56595
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AS8966
AS8966
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AS8359
AS8359
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AS25369
AS25369
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AS2119
AS2119
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Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 109.144.0.0/12 | AS2856 | — |
| 109.180.0.0/15 | AS2856 | — |
| 109.205.158.0/24 | AS2856 | — |
| 109.249.0.0/16 | AS2856 | — |
| 132.146.0.0/16 | AS2856 | — |
| 132.153.244.0/24 | AS2856 | — |
| 132.153.245.0/24 | AS2856 | — |
| 132.153.246.0/24 | AS2856 | — |
| 132.153.247.0/24 | AS2856 | — |
| 132.153.248.0/24 | AS2856 | — |
| 132.153.249.0/24 | AS2856 | — |
| 132.153.250.0/24 | AS2856 | — |
| 132.153.251.0/24 | AS2856 | — |
| 132.153.252.0/24 | AS2856 | — |
| 132.153.253.0/24 | AS2856 | — |
| 132.153.254.0/24 | AS2856 | — |
| 132.153.3.0/24 | AS2856 | — |
| 132.244.79.0/24 | AS2856 | — |
| 138.108.94.0/24 | AS2856 | — |
| 142.205.162.0/23 | AS2856 | — |
| 143.223.132.0/24 | AS2856 | — |
| 144.177.74.0/23 | AS2856 | — |
| 144.87.0.0/21 | AS2856 | — |
| 144.87.128.0/18 | AS2856 | — |
| 144.87.16.0/20 | AS2856 | — |
| 144.87.24.0/21 | AS2856 | — |
| 144.87.24.0/22 | AS2856 | — |
| 144.87.28.0/22 | AS2856 | — |
| 145.79.172.0/22 | AS2856 | — |
| 147.148.0.0/14 | AS2856 | — |
| 147.152.0.0/16 | AS2856 | — |
| 147.189.68.0/22 | AS2856 | — |
| 147.189.76.0/22 | AS2856 | — |
| 147.78.68.0/22 | AS2856 | — |
| 148.252.3.0/24 | AS2856 | — |
| 148.252.7.0/24 | AS2856 | — |
| 148.253.220.0/23 | AS2856 | — |
| 149.117.130.0/24 | AS2856 | — |
| 149.254.0.0/16 | AS2856 | — |
| 149.254.1.0/24 | AS2856 | — |
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Related lookups and next steps
WHOIS vs ASN Ownership Guide
Continue from this ASN into the differences between WHOIS ownership and ASN ownership.
Routing Troubleshooting and Network Analysis
Continue from this ASN into route troubleshooting and network analysis.
Cloud Network and ASN Comparison
Useful when you want to compare this ASN against larger cloud and edge networks.
WHOIS and IP Ownership Guide
Continue from the ASN page into WHOIS and ownership verification.
Frequently asked questions about this ASN page
What does AS2856 represent?
AS2856 is an autonomous system number used to identify an independently operated network. The current page associates it with BT-UK-AS - British Telecommunications PLC in an unknown region, which helps determine whether it behaves like a cloud provider, ISP, CDN, or enterprise backbone.
What are peers, upstreams, and prefixes useful for on the AS2856 page?
They help explain the scale, interconnection depth, and route structure of AS2856. 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 AS2856?
The best next step is usually to return to a concrete IP landing page to see how a specific address maps into AS2856, then continue into cloud, WHOIS, or routing topic pages to understand the network in a broader context.
Related topics
WHOIS vs ASN Ownership Guide
Understand why WHOIS ownership and ASN ownership can differ, and how to combine both when deciding who really owns or operates an IP.
WHOIS and IP Ownership Guide
Use WHOIS, ASN, prefixes, and organization data to determine who ultimately owns an IP, range, or resolved domain target.
BGP and ASN Basics Guide
Learn what ASN, BGP routes, prefixes, upstreams, downstreams, and peers mean, then explore real ASN pages.
Cloud Network and ASN Comparison
Compare large cloud and edge networks such as Google, Cloudflare, Microsoft, and Amazon through their ASN landing pages.