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.

7 hosts · 262 ms

HostCertsFirst seenLast seen
ooly.com 13 2026-05-16 2026-09-25
wholesale.ooly.com 3 2025-08-01 2026-08-01
www.wholesale.ooly.com 3 2025-08-01 2026-08-01
remote.ooly.com 1 2026-01-25 2026-01-25
www.remote.ooly.com 1 2026-01-25 2026-01-25
blog.ooly.com 20 2026-04-19 2026-10-07
www.ooly.com 17 2026-05-17 2026-09-26

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