AS13205 — BTWWIDC-H Autonomous System

AS13205 announces 4 IPv4 prefixes covering 16,896 addresses and 0 IPv6 prefixes.

About this network

A hosting registry from a retired brand still holds every block, and two of them name nobody at all.

What it's used for

• A content hosting network of a large telecommunications company in the United Kingdom. 17,664 addresses across eight IPv4 prefixes, two observed BGP neighbours, and no IPv6 announced.

Notable

• Six blocks list Ignite Content Hosting Registry first, ahead of the operating company and a corporate registry contact.
• 137.213.252.0/23 and 137.213.239.0/24 are netname STERIAUK with the registrant recorded as unknown.
• The AS handle is BTWWIDC-H Autonomous System.
• Eighteen addresses were sampled and none returned a name.

Interesting

• Three contacts on one block, in order of decreasing specificity, is a large organisation's answer to the question of who owns an address: the hosting arm, the legal entity, and the group registry that arbitrates between them. Each was added by someone solving a different problem.
• Two blocks carry a netname from an entirely separate services company with no registrant recorded. The lookup returned a record and the record names no party, which is different from a lookup that failed, and it means the trail ends there.
• Space adjacent to some of these prefixes, in the same range, is announced from another country by an unrelated operator elsewhere in this sweep. Neighbouring addresses have separate owners here.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 31.11.56.0/23
• 78.109.0.0/20
• 217.140.0.0/20
• 217.140.32.0/19

Upstream networks

• AS5400 British Telecommunications Limited
• AS2856 British Telecommunications Limited

Adjacent networks

• AS5400 British Telecommunications Limited
• AS2856 British Telecommunications Limited