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.

4 hosts · 269 ms

HostCertsFirst seenLast seenDNS
moncompte.notif.laposte.fr 5 2026-05-31 2026-09-28 ok
mta-sts.moncompte.notif.laposte.fr 5 2026-05-31 2026-09-28 ok
t.moncompte.notif.laposte.fr 4 2026-02-11 2026-09-25 ok
www.moncompte.notif.laposte.fr 5 2026-05-31 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/moncompte.notif.laposte.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/moncompte.notif.laposte.fr.