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.

5 hosts · 232 ms

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HostCertsFirst seenLast seen
maxit.wien 1 2026-02-20 2026-02-20
marketplace.maxit.wien 5 2026-05-12 2026-09-09
helpdesk.maxit.wien 2 2026-03-04 2026-08-04
rmm.maxit.wien 1 2026-01-13 2026-01-13
www.maxit.wien 1 2026-02-20 2026-02-20

Programmatic access: API GET /v1/hosts/maxit.wien (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/maxit.wien.