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.

18 hosts · 287 ms

HostCertsFirst seenLast seen
healthspan.co.uk 5 2026-01-23 2026-09-17
*.healthspan.co.uk 1 2026-01-23 2026-01-23
sc.healthspan.co.uk 5 2026-05-30 2026-09-27
hybrid.healthspan.co.uk 2 2025-07-14 2026-07-20
m.service.healthspan.co.uk 2 2025-07-15 2026-06-15
res.service.healthspan.co.uk 2 2025-07-15 2026-06-15
t.service.healthspan.co.uk 2 2025-07-15 2026-06-15
remote.healthspan.co.uk 1 2026-02-04 2026-02-04
www.remote.healthspan.co.uk 1 2026-02-04 2026-02-04
admin.healthspan.co.uk 5 2026-04-24 2026-08-23
autodiscover.healthspan.co.uk 2 2025-07-14 2026-07-20
m.emails.healthspan.co.uk 4 2025-07-20 2026-07-05
res.emails.healthspan.co.uk 4 2025-07-20 2026-07-05
t.emails.healthspan.co.uk 4 2025-07-20 2026-07-05
careers.healthspan.co.uk 1 2025-11-28 2025-11-28
sts.healthspan.co.uk 2 2025-07-14 2026-07-20
mta-sts.healthspan.co.uk 2 2026-03-09 2026-07-25
www.healthspan.co.uk 4 2026-05-18 2026-09-17

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