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 · 241 ms

HostCertsFirst seenLast seenDNS
vacancesaircanada.com 1 2026-04-08 2026-04-08 ok
*.vacancesaircanada.com 2 2026-03-17 2026-04-08 —
page.vacancesaircanada.com 16 2026-05-26 2026-09-21 ok
inspire.vacancesaircanada.com 20 2026-05-26 2026-09-21 ok
revesdesoleil.vacancesaircanada.com 8 2026-05-04 2026-08-30 ok
agents.revesdesoleil.vacancesaircanada.com 12 2026-05-03 2026-08-30 ok
coupsdecoeurdesvoyageurs.vacancesaircanada.com 8 2026-05-08 2026-09-03 ok

Programmatic access, with DNS A records: API GET /v1/hosts/vacancesaircanada.com (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/vacancesaircanada.com.