Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

7 hosts · 339 ms

HostCertsFirst seenLast seenDNS
army.fit 30 2026-04-11 2026-10-05 ok
*.army.fit 13 2026-04-11 2026-10-05 —
bimi.army.fit 2 2026-08-26 2026-08-26 ok
link.army.fit 2 2026-08-24 2026-08-24 ok
*.link.army.fit 2 2026-08-24 2026-08-24 —
www.army.fit 13 2026-04-11 2026-10-02 ok
*.www.army.fit 3 2026-10-02 2026-10-02 —

Programmatic access, with DNS A records: API GET /v1/hosts/army.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/army.fit.