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 · 240 ms

Download CSV
HostCertsFirst seenLast seen
safetytools.com 15 2026-04-23 2026-10-18
*.safetytools.com 15 2026-04-23 2026-10-18
staging.safetytools.com 6 2026-04-26 2026-10-14
blog.safetytools.com 9 2026-06-15 2026-10-18
info.safetytools.com 13 2026-06-16 2026-10-18
sst.safetytools.com 5 2026-05-08 2026-09-06

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