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.

9 hosts · 295 ms

HostCertsFirst seenLast seenDNS
stanleysteemer.com 40 2025-07-23 2026-08-26 ok
*.stanleysteemer.com 39 2025-07-23 2026-08-26 —
static.stanleysteemer.com 1 2026-07-07 2026-07-07 ok
link.email.stanleysteemer.com 12 2026-05-08 2026-09-03 ok
links.email.stanleysteemer.com 5 2026-05-10 2026-09-08 ok
link.commemail.stanleysteemer.com 18 2026-05-08 2026-09-03 ok
links.commemail.stanleysteemer.com 5 2026-05-10 2026-09-08 ok
sgtm.stanleysteemer.com 3 2026-05-19 2026-09-05 ok
qa.metrics.stanleysteemer.com 3 2026-05-28 2026-09-11 ok

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