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.

7 hosts · 191 ms

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HostCertsFirst seenLast seen
universaltennis.com 2 2025-09-17 2026-08-03
*.universaltennis.com 2 2025-09-17 2026-08-03
blog.universaltennis.com 16 2026-04-19 2026-10-02
qa-admin.universaltennis.com 3 2026-02-21 2026-10-05
support.universaltennis.com 11 2026-05-21 2026-09-17
new.universaltennis.com 16 2026-05-30 2026-10-06
www.universaltennis.com 19 2026-05-28 2026-09-30

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