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.

3 hosts · 243 ms

HostCertsFirst seenLast seenDNS
image.crocs-email.com 3 2026-06-02 2026-06-13 ok
click.crocs-email.com 2 2025-09-16 2026-09-03 ok
view.crocs-email.com 2 2025-09-16 2026-09-04 ok

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