Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

4 hosts · 318 ms

HostCertsFirst seenLast seenDNS
cloud.emails.calclosets.com 1 2026-01-07 2026-01-07 ok
image.emails.calclosets.com 4 2025-12-31 2026-09-06 ok
click.emails.calclosets.com 1 2026-01-01 2026-01-01 ok
view.emails.calclosets.com 1 2026-01-09 2026-01-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/emails.calclosets.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/emails.calclosets.com.