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.

10 hosts · 262 ms

HostCertsFirst seenLast seenDNS
petrescue.com.au 5 2025-11-04 2026-10-04 ok
*.petrescue.com.au 7 2025-11-04 2026-10-04 —
img.petrescue.com.au 1 2026-02-05 2026-02-05 nxdomain
*.img.petrescue.com.au 1 2026-02-05 2026-02-05 —
staging.petrescue.com.au 2 2026-03-31 2026-08-31 ok
*.staging.petrescue.com.au 7 2025-11-04 2026-10-04 —
production.petrescue.com.au 2 2026-03-31 2026-08-31 ok
*.production.petrescue.com.au 7 2025-11-04 2026-10-04 —
impact.petrescue.com.au 10 2026-05-04 2026-08-30 ok
support.petrescue.com.au 5 2026-04-27 2026-08-24 ok

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