Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

5 hosts · 228 ms

HostCertsFirst seenLast seen
reynasa.com 1 2026-06-19 2026-06-19
*.reynasa.com 1 2026-06-19 2026-06-19
portal.reynasa.com 5 2026-05-04 2026-09-02
docs.reynasa.com 4 2026-04-12 2026-08-10
boletines.reynasa.com 5 2026-05-12 2026-09-09

Programmatic access: API GET /v1/hosts/reynasa.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/reynasa.com.