Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

3 hosts · 358 ms

HostCertsFirst seenLast seenDNS
lua.legal 10 2025-09-09 2026-09-24 ok
*.lua.legal 9 2026-05-11 2026-09-24 —
www.lua.legal 1 2025-09-10 2025-09-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/lua.legal (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/lua.legal.