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.

3 hosts · 237 ms

HostCertsFirst seenLast seenDNS
sterlingvan.co.uk 3 2026-06-21 2026-09-04 ok
mta-sts.sterlingvan.co.uk 3 2025-10-17 2026-09-17 ok
www.sterlingvan.co.uk 3 2026-06-21 2026-09-04 ok

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