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.

3 hosts · 277 ms

Download CSV
HostCertsFirst seenLast seen
kompozite.io 3 2026-05-06 2026-10-06
*.kompozite.io 4 2025-07-06 2026-10-06
www.kompozite.io 2 2026-09-19 2026-09-19

Programmatic access: API GET /v1/hosts/kompozite.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/kompozite.io.