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.

4 hosts · 350 ms

HostCertsFirst seenLast seen
omnitype.com 17 2026-05-20 2026-09-30
feedback.omnitype.com 5 2026-06-04 2026-08-29
account.omnitype.com 16 2026-04-14 2026-10-10
www.omnitype.com 16 2026-05-21 2026-10-01

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