Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

9 hosts · 262 ms

HostCertsFirst seenLast seenDNS
bpa.co.uk 5 2025-08-05 2026-09-13 ok
*.bpa.co.uk 3 2026-09-09 2026-09-13 —
remote.bpa.co.uk 2 2025-09-12 2026-10-06 ok
www.remote.bpa.co.uk 2 2025-09-12 2026-10-06 nxdomain
guardian.bpa.co.uk 2 2025-09-12 2026-10-06 ok
www.guardian.bpa.co.uk 2 2025-09-12 2026-10-06 nxdomain
mta-sts.bpa.co.uk 2 2025-08-17 2026-07-18 ok
support.bpa.co.uk 3 2025-10-13 2026-09-13 ok
www.bpa.co.uk 2 2025-08-05 2026-07-29 ok

Programmatic access, with DNS A records: API GET /v1/hosts/bpa.co.uk (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/bpa.co.uk.