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.

10 hosts · 299 ms

HostCertsFirst seenLast seenDNS
functionalpatterns.com 36 2026-04-24 2026-10-02 ok
*.functionalpatterns.com 20 2026-04-24 2026-09-21 —
jhgadftqwuihxsa2135987courseone.functionalpatterns.com 5 2026-05-12 2026-08-31 ok
www.jhgadftqwuihxsa2135987courseone.functionalpatterns.com 5 2026-05-12 2026-08-31 ok
store.functionalpatterns.com 13 2026-05-11 2026-09-19 ok
forms.functionalpatterns.com 4 2026-05-26 2026-08-23 ok
orders.functionalpatterns.com 3 2026-07-06 2026-09-04 ok
practitioners.functionalpatterns.com 17 2026-05-21 2026-10-01 ok
www.functionalpatterns.com 16 2026-05-22 2026-09-29 ok
quiz.functionalpatterns.com 4 2026-07-22 2026-09-19 ok

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