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.

10 hosts · 345 ms

HostCertsFirst seenLast seenDNS
aircanadavacations.com 2 2025-07-17 2026-07-16 ok
*.aircanadavacations.com 2 2025-07-17 2026-07-16 —
page.aircanadavacations.com 18 2026-05-25 2026-09-20 ok
inspire.aircanadavacations.com 20 2026-05-26 2026-09-21 ok
email.aircanadavacations.com 5 2026-05-30 2026-09-27 ok
dreamofsun.aircanadavacations.com 8 2026-05-02 2026-08-28 ok
agents.dreamofsun.aircanadavacations.com 9 2026-05-31 2026-09-26 ok
travellerstoppicks.aircanadavacations.com 14 2026-04-10 2026-10-04 ok
cars.aircanadavacations.com 5 2026-06-04 2026-10-02 ok
dreammakers.aircanadavacations.com 3 2026-07-03 2026-09-01 ok

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