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.

7 hosts · 253 ms

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HostCertsFirst seenLast seen
apo24.ch 20 2026-02-26 2026-09-24
*.apo24.ch 20 2026-02-26 2026-09-24
img-hse.apo24.ch 2 2026-04-17 2026-08-31
content-hse.apo24.ch 8 2026-05-03 2026-09-30
etrack.apo24.ch 16 2026-05-21 2026-09-29
partner.apo24.ch 11 2026-07-20 2026-09-18
support.apo24.ch 5 2026-05-29 2026-09-26

Programmatic access: API GET /v1/hosts/apo24.ch (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/apo24.ch.