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 · 313 ms

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HostCertsFirst seenLast seen
s-squaresystems.com 23 2026-05-01 2026-10-07
*.s-squaresystems.com 18 2026-06-05 2026-10-07
landing.s-squaresystems.com 5 2026-05-05 2026-10-14
www.s-squaresystems.com 5 2026-05-01 2026-08-30

Programmatic access: API GET /v1/hosts/s-squaresystems.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/s-squaresystems.com.