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.

4 hosts · 283 ms

HostCertsFirst seenLast seen
secureme.it 1 2025-10-13 2025-10-13
*.secureme.it 1 2025-10-13 2025-10-13
exchange.secureme.it 5 2026-05-21 2026-09-18
mta-sts.secureme.it 5 2026-04-22 2026-08-18

Programmatic access: API GET /v1/hosts/secureme.it (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/secureme.it.