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 · 310 ms

HostCertsFirst seenLast seenDNS
realsatisfied.com 1 2026-02-11 2026-02-11 ok
*.realsatisfied.com 1 2026-02-11 2026-02-11 —
tracking.realsatisfied.com 1 2026-04-16 2026-04-16 ok
us.realsatisfied.com 1 2025-12-22 2025-12-22 nodata
*.us.realsatisfied.com 1 2025-12-22 2025-12-22 —
support.realsatisfied.com 4 2026-06-04 2026-10-03 ok

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