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.

14 hosts · 227 ms

HostCertsFirst seenLast seen
skills-base.com 18 2026-01-15 2026-09-22
*.skills-base.com 24 2026-01-15 2026-09-22
qa.skills-base.com 1 2025-07-07 2025-07-07
*.qa.skills-base.com 1 2025-07-07 2025-07-07
*.api.skills-base.com 2 2026-08-24 2026-08-24
validation.skills-base.com 3 2026-02-10 2026-02-10
*.validation.skills-base.com 2 2026-02-10 2026-02-10
help.skills-base.com 1 2025-12-05 2025-12-05
test.skills-base.com 5 2026-04-29 2026-09-29
*.test.skills-base.com 9 2026-04-28 2026-08-20
*.api-us.test.skills-base.com 4 2026-08-20 2026-08-20
*.api-au.test.skills-base.com 4 2026-08-20 2026-08-20
*.api-au.skills-base.com 2 2026-08-24 2026-08-24
*.api-eu.skills-base.com 2 2026-08-24 2026-08-24

Programmatic access: API GET /v1/hosts/skills-base.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/skills-base.com.