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.

11 hosts · 309 ms

HostCertsFirst seenLast seenDNS
getfrank.com 24 2026-04-12 2026-09-20 ok
*.getfrank.com 14 2026-04-12 2026-09-20 —
app.staging.getfrank.com 7 2026-04-18 2026-09-23 ok
feedback.getfrank.com 9 2026-05-30 2026-09-25 ok
links-trk.getfrank.com 3 2026-05-11 2026-08-29 ok
help.getfrank.com 9 2026-05-31 2026-09-27 ok
app.getfrank.com 6 2026-04-13 2026-09-22 ok
links.getfrank.com 3 2026-05-11 2026-08-27 ok
www.getfrank.com 11 2026-05-03 2026-09-03 ok
fluffy.getfrank.com 5 2026-04-24 2026-08-22 ok
quiz.getfrank.com 1 2026-08-11 2026-08-11 ok

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