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 · 357 ms

HostCertsFirst seenLast seenDNS
fitoncare.com 10 2026-04-22 2026-08-18 ok
*.fitoncare.com 4 2025-09-18 2026-08-20 —
secure.fitoncare.com 1 2025-11-19 2025-11-19 ok
www.fitoncare.com 8 2026-04-24 2026-08-20 ok

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