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 · 236 ms

HostCertsFirst seenLast seen
westhighlandha.co.uk 4 2026-04-18 2026-08-12
mta-sts.westhighlandha.co.uk 3 2026-05-09 2026-08-03
www.westhighlandha.co.uk 4 2026-04-18 2026-08-12
my.westhighlandha.co.uk 2 2025-11-08 2026-10-08

Programmatic access: API GET /v1/hosts/westhighlandha.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/westhighlandha.co.uk.