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.

6 hosts · 281 ms

HostCertsFirst seenLast seenDNS
email.flooranddecor.com 1 2026-05-21 2026-05-21 servfail
cloud.email.flooranddecor.com 1 2025-11-07 2025-11-07 servfail
image.email.flooranddecor.com 3 2025-10-01 2026-08-31 servfail
click.email.flooranddecor.com 1 2025-11-06 2025-11-06 servfail
view.email.flooranddecor.com 1 2025-11-06 2025-11-06 servfail
www.email.flooranddecor.com 1 2026-05-21 2026-05-21 servfail

Programmatic access, with DNS A records: API GET /v1/hosts/email.flooranddecor.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/email.flooranddecor.com.