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.

5 hosts · 346 ms

HostCertsFirst seenLast seenDNS
fa.lk 11 2026-04-18 2026-09-17 ok
*.fa.lk 7 2026-04-27 2026-09-17 —
a.fa.lk 11 2026-06-02 2026-09-28 ok
alexander.fa.lk 9 2026-06-01 2026-09-27 ok
www.fa.lk 9 2026-06-01 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/fa.lk (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/fa.lk.