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 · 213 ms

HostCertsFirst seenLast seen
safercy.com 11 2026-04-12 2026-09-12
*.safercy.com 7 2026-05-17 2026-09-12
track.safercy.com 10 2026-04-24 2026-09-18
www.safercy.com 4 2026-04-12 2026-08-29

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