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.

13 hosts · 267 ms

HostCertsFirst seenLast seen
bestsecret.at 19 2026-04-18 2026-09-24
*.bestsecret.at 22 2026-04-18 2026-09-24
staging-release.bestsecret.at 4 2026-04-18 2026-08-16
*.staging-release.bestsecret.at 4 2026-04-18 2026-08-16
sdlmaf.bestsecret.at 3 2026-05-07 2026-10-02
sgtm.bestsecret.at 3 2026-05-21 2026-09-05
www.sgtm.bestsecret.at 4 2026-04-24 2026-10-04
help.bestsecret.at 1 2025-10-29 2025-10-29
www.help.bestsecret.at 1 2025-10-29 2025-10-29
staging-master.bestsecret.at 4 2026-04-18 2026-08-16
*.staging-master.bestsecret.at 4 2026-04-18 2026-08-16
sgtm-dev.bestsecret.at 3 2026-04-30 2026-08-16
www.sgtm-dev.bestsecret.at 5 2026-04-18 2026-09-27

Programmatic access: API GET /v1/hosts/bestsecret.at (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/bestsecret.at.