Country
—
ASN LANDING PAGE
AS13205
British Telecommunications PLC
Last updated · Apr 4, 2026
Total prefixes
16
IPv4 prefixes
16
IPv6 prefixes
0
ASN summary
How to read the scale of AS13205
British Telecommunications PLC currently shows 16 prefixes and 2 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 AS13205?
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 AS13205 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
AS13205 ASN lookupAS13205 BGPAS13205 peersAS13205 prefixesAS13205 upstreamsBritish Telecommunications PLC ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
Detailed data for this ASN is not available right now.
Peers
Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 137.213.239.0/24 | AS13205 | — |
| 137.213.252.0/23 | AS13205 | — |
| 217.140.0.0/20 | AS13205 | — |
| 217.140.12.0/22 | AS13205 | — |
| 217.140.12.0/24 | AS13205 | — |
| 217.140.13.0/24 | AS13205 | — |
| 217.140.32.0/19 | AS13205 | — |
| 31.11.56.0/23 | AS13205 | — |
| 78.109.0.0/20 | AS13205 | — |
| 78.109.0.0/24 | AS13205 | — |
| 78.109.10.0/24 | AS13205 | — |
| 78.109.11.0/24 | AS13205 | — |
| 78.109.5.0/24 | AS13205 | — |
| 78.109.6.0/24 | AS13205 | — |
| 78.109.7.0/24 | AS13205 | — |
| 78.109.9.0/24 | AS13205 | — |
Related ASN pages
AS15169 · Google
A strong reference ASN for Google DNS, Google Cloud, and global network footprint analysis.
AS13335 · Cloudflare
Useful for analyzing CDN, Anycast, WAF, and large-scale edge network behavior.
AS8075 · Microsoft
Helpful when comparing Azure, enterprise backbone, and large-cloud routing patterns.
AS16509 · Amazon
A useful ASN landing page for understanding AWS and large cloud-network ownership.
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 AS13205 represent?
AS13205 is an autonomous system number used to identify an independently operated network. The current page associates it with 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 AS13205 page?
They help explain the scale, interconnection depth, and route structure of AS13205. 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 AS13205?
The best next step is usually to return to a concrete IP landing page to see how a specific address maps into AS13205, 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.