AS5400 British Telecommunications Limited
AS5400 (BT) is registered to British Telecommunications Limited in GB. It originates 125 prefixes in the global routing table.
Who holds AS5400
Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.
What AS5400 announces
Prefixes originated by AS5400 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).
Announced prefixes
Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.
RPKI valid RPKI invalid no ROA covers it
Who AS5400 is reached through
The AS just before AS5400 in the paths our looking glass collectors hold, for 60 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.
Routing registry objects
From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.
| Source | as-name | Maintained by |
|---|---|---|
| RIPE | BT | RIPE-NCC-END-MNT, CIP-MNT |
Route objects with origin AS5400: RIPE 205 · ARIN 39 · APNIC 27 · LEVEL3 13 · NTTCOM 5 · AFRINIC 1 · RADB 1