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.

3 hosts · 314 ms

HostCertsFirst seenLast seenDNS
lci.fr 1 2026-02-17 2026-02-17 ok
*.lci.fr 1 2026-02-17 2026-02-17 —
podcasts.lci.fr 1 2025-12-11 2025-12-11 ok

Programmatic access, with DNS A records: API GET /v1/hosts/lci.fr (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/lci.fr.