AS2856 — BT

IP address range examples

Below are up to three IPv4 and three IPv6 prefix examples. Counts cover the source observation window, not a complete real-time routing table. They do not establish reachability for every address or an end user’s location.

• 109.144.0.0/12
• 109.180.0.0/15
• 109.205.158.0/24
• 2001:4878:c259::/48
• 2a00:2380::/25
• 2a01:4c8::/29

How to use this ASN profile

Compare the ASN in an IP lookup with AS2856 to check whether an exit belongs to the expected routing network. Operators can use multiple ASNs, and transfers or BGP changes can alter the originating network. Compare this dated snapshot with a current lookup of the specific IP.

Data sources

• RIPEstat — AS overview ↗
• RIPEstat — Announced prefixes ↗
• RIPEstat — WHOIS ↗