Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

19 hosts · 350 ms

HostCertsFirst seenLast seen
found.com 91 2026-04-21 2026-10-08
*.found.com 53 2026-04-21 2026-10-08
dd.found.com 8 2026-05-21 2026-09-16
*.dd.found.com 8 2026-05-21 2026-09-16
staging.found.com 18 2026-05-14 2026-10-02
*.staging.found.com 19 2026-06-06 2026-10-02
external.staging.found.com 8 2026-06-06 2026-10-02
payments.staging.found.com 8 2026-06-06 2026-10-02
my.staging.found.com 8 2026-06-06 2026-10-02
external.found.com 8 2026-06-06 2026-10-02
link.email.found.com 13 2026-04-21 2026-08-31
link.hello.found.com 10 2026-04-21 2026-08-17
demo.found.com 2 2026-09-24 2026-09-24
*.demo.found.com 2 2026-09-24 2026-09-24
fp.found.com 1 2026-01-09 2026-01-09
payments.found.com 8 2026-06-06 2026-10-02
sanctions-lists.found.com 2 2026-10-06 2026-10-06
*.sanctions-lists.found.com 2 2026-10-06 2026-10-06
my.found.com 8 2026-06-06 2026-10-02

Programmatic access: API GET /v1/hosts/found.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/found.com.