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 · 270 ms

HostCertsFirst seenLast seen
cloud.email.cafod.org.uk 2 2025-08-14 2026-08-03
image.email.cafod.org.uk 6 2025-07-31 2026-09-21
click.email.cafod.org.uk 2 2025-08-14 2026-08-01
view.email.cafod.org.uk 2 2025-08-11 2026-07-29

Programmatic access: API GET /v1/hosts/email.cafod.org.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.cafod.org.uk.