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.

4 hosts · 304 ms

HostCertsFirst seenLast seenDNS
foyles.co.uk 3 2026-04-16 2026-10-02 ok
*.foyles.co.uk 3 2026-04-16 2026-10-02 —
cdn.foyles.co.uk 8 2026-05-21 2026-09-17 ok
www.foyles.co.uk 12 2026-04-28 2026-08-25 ok

Programmatic access, with DNS A records: API GET /v1/hosts/foyles.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/foyles.co.uk.