Find every subdomain
of a domain.

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

3 hosts · 244 ms

HostCertsFirst seenLast seen
mta-sts.audio-technica.co.uk 1 2025-12-31 2025-12-31
pwreset.audio-technica.co.uk 1 2025-12-14 2025-12-14
www.pwreset.audio-technica.co.uk 1 2025-12-14 2025-12-14

Programmatic access: API GET /v1/hosts/audio-technica.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/audio-technica.co.uk.