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 · 256 ms

HostCertsFirst seenLast seenDNS
watersafetyshop.com 2 2026-01-31 2026-06-16 ok
*.watersafetyshop.com 1 2026-01-31 2026-01-31 —
mta-sts.watersafetyshop.com 4 2026-04-16 2026-08-14 ok
www.watersafetyshop.com 1 2026-06-16 2026-06-16 ok

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