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.

19 hosts · 335 ms

HostCertsFirst seenLast seenDNS
gofreddie.com 14 2026-05-11 2026-10-05 ok
*.gofreddie.com 9 2026-04-04 2026-10-05 —
help-usa.gofreddie.com 6 2026-03-22 2026-08-22 ok
staging.gofreddie.com 1 2026-02-17 2026-02-17 ok
api-staging.gofreddie.com 5 2026-05-19 2026-09-17 ok
start-staging.gofreddie.com 5 2026-05-11 2026-09-09 ok
www-staging.gofreddie.com 12 2026-06-04 2026-10-01 ok
api.gofreddie.com 5 2026-05-23 2026-09-21 ok
link.gofreddie.com 4 2026-06-05 2026-10-03 ok
join.gofreddie.com 16 2026-05-20 2026-09-15 ok
go.gofreddie.com 12 2026-04-12 2026-10-06 ok
help.gofreddie.com 4 2026-04-19 2026-08-17 ok
shop.gofreddie.com 5 2026-05-05 2026-09-02 ok
app.gofreddie.com 2 2026-04-09 2026-09-09 ok
labs.gofreddie.com 7 2026-04-28 2026-08-25 ok
links.gofreddie.com 4 2026-06-05 2026-10-03 ok
track-aws.gofreddie.com 1 2025-12-07 2025-12-07 ok
start.gofreddie.com 5 2026-05-11 2026-09-09 ok
www.gofreddie.com 10 2026-05-18 2026-09-13 ok

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