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.

10 hosts · 256 ms

HostCertsFirst seenLast seen
email.specsavers.com.au 1 2025-10-01 2025-10-01
res3.email.specsavers.com.au 5 2025-10-13 2026-09-14
t3.email.specsavers.com.au 4 2025-10-13 2026-09-13
m4.email.specsavers.com.au 6 2025-07-21 2026-09-13
res4.email.specsavers.com.au 5 2025-07-21 2026-09-14
t4.email.specsavers.com.au 4 2025-07-21 2026-06-21
web.email.specsavers.com.au 3 2025-07-21 2026-06-21
m.email.specsavers.com.au 3 2025-07-21 2026-06-21
res.email.specsavers.com.au 3 2025-07-21 2026-06-21
t.email.specsavers.com.au 3 2025-07-21 2026-06-21

Programmatic access: API GET /v1/hosts/email.specsavers.com.au (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.specsavers.com.au.