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.

8 hosts · 274 ms

HostCertsFirst seenLast seenDNS
francetravail.io 7 2025-07-23 2026-06-19 ok
ia.francetravail.io 1 2026-01-20 2026-01-20 ok
authentification-partenaire.francetravail.io 1 2026-06-04 2026-06-04 ok
api.francetravail.io 4 2025-08-07 2026-07-09 ok
designsystem.francetravail.io 1 2026-03-05 2026-03-05 ok
api-mtls.francetravail.io 1 2025-12-23 2025-12-23 ok
status.francetravail.io 1 2026-05-29 2026-05-29 ok
www.francetravail.io 3 2025-12-29 2026-02-18 ok

Programmatic access, with DNS A records: API GET /v1/hosts/francetravail.io (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/francetravail.io.