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.

5 hosts · 328 ms

HostCertsFirst seenLast seenDNS
firedeptcoffee.com 15 2026-05-15 2026-09-24 ok
mta-sts.firedeptcoffee.com 6 2026-06-03 2026-10-01 ok
invest.firedeptcoffee.com 2 2025-06-09 2026-05-10 nodata
punchout.firedeptcoffee.com 17 2026-04-18 2026-10-01 ok
www.firedeptcoffee.com 14 2026-05-16 2026-09-25 ok

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