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.

17 hosts · 437 ms

HostCertsFirst seenLast seenDNS
sheplers.com 10 2025-10-02 2026-09-22 ok
*.sheplers.com 2 2025-10-02 2026-09-22 —
staging.sheplers.com 19 2026-05-17 2026-09-25 ok
track.sheplers.com 1 2026-05-12 2026-05-12 ok
d.p.sheplers.com 12 2026-05-04 2026-08-30 ok
e.p.sheplers.com 12 2026-05-04 2026-08-30 ok
se.p.sheplers.com 10 2026-05-03 2026-08-29 ok
mg.p.sheplers.com 4 2026-04-17 2026-08-15 ok
preferences.p.sheplers.com 14 2026-05-08 2026-09-04 ok
forms.p.sheplers.com 6 2026-04-18 2026-08-15 ok
htiagq.sheplers.com 4 2026-05-19 2026-10-01 ok
s.sheplers.com 18 2026-05-25 2026-09-21 ok
returns.sheplers.com 1 2026-05-12 2026-05-12 ok
mg.t.sheplers.com 4 2026-04-17 2026-08-15 ok
development.sheplers.com 16 2026-05-17 2026-09-13 ok
auth-dev.sheplers.com 1 2026-03-11 2026-03-11 ok
www.sheplers.com 18 2026-04-12 2026-10-06 ok

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