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 · 306 ms

HostCertsFirst seenLast seenDNS
greatwolfmail.com 16 2026-04-18 2026-09-14 ok
*.greatwolfmail.com 16 2026-04-18 2026-09-14 —
mi.greatwolfmail.com 5 2026-04-28 2026-09-23 ok
image.email.greatwolfmail.com 3 2025-07-15 2026-06-16 ok
click.email.greatwolfmail.com 1 2026-01-12 2026-01-12 ok
pages.email.greatwolfmail.com 1 2026-01-12 2026-01-12 ok
view.email.greatwolfmail.com 1 2026-01-12 2026-01-12 ok

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