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.

8 hosts · 259 ms

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HostCertsFirst seenLast seen
living.fit 28 2026-04-28 2026-10-10
*.living.fit 11 2026-04-28 2026-09-29
api.living.fit 3 2026-04-28 2026-09-28
app.living.fit 3 2026-06-17 2026-08-18
www.app.living.fit 5 2026-04-23 2026-08-24
account.living.fit 11 2026-04-26 2026-09-04
checkout.living.fit 11 2026-05-31 2026-10-11
www.living.fit 18 2026-05-30 2026-10-09

Programmatic access: API GET /v1/hosts/living.fit (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/living.fit.