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.

6 hosts · 249 ms

HostCertsFirst seenLast seen
roomies.com 28 2026-02-19 2026-10-05
*.roomies.com 19 2026-02-19 2026-10-05
og.roomies.com 1 2026-04-20 2026-04-20
assets.roomies.com 12 2026-04-13 2026-10-08
fingerprint.roomies.com 4 2026-06-18 2026-08-16
www.roomies.com 10 2026-05-09 2026-09-09

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