$ query “AS13205” --type=asn → 1 result(s)
AS13205 · BRITISH-TELECOMMUNICATIONS-PLC
British Telecommunications Limited
AS13205 is owned by British Telecommunications Limited and is a stub network, based in the United Kingdom. The system announces a respectable 17 664 IPv4 addresses. Most of its address space is geolocated to the Netherlands, with additional presence in the United Kingdom. No IPv6 support — it's 2026, just saying.
Basic Information
- Country
- 🇬🇧 United Kingdom
- Category
- Internet Service Provider
- Network Role
- Stub Network
- Data Origin
- Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
- Last Changed
- June 30, 2026
- Last Seen
- July 19, 2026 (active)
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 16 / 6
- IPv6 Prefixes (raw / aggregated)
- 0 / 0
- IPv4 Addresses
- 17 664
- Largest IPv4 Prefix
- /19 (8 192 addresses)
- Geolocated Countries
- 🇳🇱 Netherlands (20 224 IPs), 🇬🇧 United Kingdom (13 824 IPs)
- Prefix Changed
- March 04, 2026
Reputation
- Reputation
- Pristine — 0 flagged IPs
Connectivity Summary
- Upstream Providers
- 2 upstreams providing transit
- Degree
- 2 unique BGP neighbors
- Reach
- 0 networks in customer cone
Upstream Providers (2)
Prefix Lists
IPv4 Prefixes (16 total)
- 217.140.32.0/19 (8 192 addresses (/19 prefix))
- 78.109.0.0/20 (4 096 addresses (/20 prefix))
- 217.140.0.0/20 (4 096 addresses (/20 prefix))
- 31.11.56.0/23 (512 addresses (/23 prefix))
- 137.213.252.0/23 (512 addresses (/23 prefix))
- 137.213.239.0/24 (256 addresses (/24 prefix))