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.

4 hosts · 287 ms

HostCertsFirst seenLast seen
cloud.email.matalan.co.uk 3 2025-09-27 2026-09-14
image.email.matalan.co.uk 3 2025-07-30 2026-08-19
click.email.matalan.co.uk 2 2025-09-30 2026-09-17
view.email.matalan.co.uk 3 2025-09-27 2026-09-14

Programmatic access: API GET /v1/hosts/email.matalan.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/email.matalan.co.uk.