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.

8 hosts · 246 ms

HostCertsFirst seenLast seen
rosterelf.com 4 2025-07-30 2026-06-30
*.rosterelf.com 4 2025-07-30 2026-06-30
staging.rosterelf.com 1 2026-01-05 2026-01-05
*.staging.rosterelf.com 1 2026-01-05 2026-01-05
feature-requests.rosterelf.com 11 2026-06-07 2026-10-04
support.rosterelf.com 5 2026-05-05 2026-09-02
dev.rosterelf.com 2 2025-12-16 2025-12-16
*.dev.rosterelf.com 2 2025-12-16 2025-12-16

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