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.

4 hosts · 273 ms

HostCertsFirst seenLast seenDNS
roberthalf.co.nz 1 2025-12-17 2025-12-17 ok
*.roberthalf.co.nz 1 2025-12-17 2025-12-17 —
tags.roberthalf.co.nz 2 2025-07-02 2026-06-02 ok
collect.roberthalf.co.nz 2 2025-07-02 2026-06-02 ok

Programmatic access, with DNS A records: API GET /v1/hosts/roberthalf.co.nz (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/roberthalf.co.nz.