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.

6 hosts · 327 ms

HostCertsFirst seenLast seenDNS
golfbox.com.au 17 2025-12-22 2026-08-17 ok
*.golfbox.com.au 16 2026-04-21 2026-08-17 —
go.golfbox.com.au 4 2026-04-21 2026-09-06 ok
help.golfbox.com.au 5 2026-05-03 2026-08-31 ok
mta-sts.golfbox.com.au 1 2026-08-11 2026-08-11 ok
www.golfbox.com.au 1 2025-12-22 2025-12-22 ok

Programmatic access, with DNS A records: API GET /v1/hosts/golfbox.com.au (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/golfbox.com.au.