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.

3 hosts · 281 ms

HostCertsFirst seenLast seen
erikpelton.com 10 2026-05-16 2026-09-28
*.erikpelton.com 10 2026-05-16 2026-09-28
office.erikpelton.com 5 2026-04-28 2026-08-26

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