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 · 310 ms

Download CSV
HostCertsFirst seenLast seen
turning.io 1 2025-12-21 2025-12-21
*.turning.io 1 2025-12-21 2025-12-21
apidoc.turning.io 2 2026-03-13 2026-08-19
api.turning.io 5 2026-05-04 2026-09-02
staging-api.turning.io 5 2026-05-09 2026-09-07
url.turning.io 6 2026-05-21 2026-09-13
admin.turning.io 5 2026-05-17 2026-09-15
partners.turning.io 5 2026-05-24 2026-09-22

Programmatic access: API GET /v1/hosts/turning.io (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/turning.io.