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 · 289 ms

HostCertsFirst seenLast seenDNS
govswift.com 12 2026-04-10 2026-10-04 ok
*.govswift.com 9 2026-01-26 2026-09-14 —
staging.govswift.com 5 2026-05-21 2026-09-20 ok
mail.govswift.com 4 2026-06-04 2026-10-04 ok
sgtm.govswift.com 3 2026-07-03 2026-09-01 ok
email.go.govswift.com 5 2026-05-06 2026-09-03 ok
staging-wp.govswift.com 4 2026-07-22 2026-09-20 ok
www.govswift.com 4 2026-06-04 2026-10-04 ok
visa-apply.govswift.com 4 2026-06-04 2026-10-04 ok
esta-apply.govswift.com 4 2026-06-04 2026-10-04 ok

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