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.

8 hosts · 236 ms

HostCertsFirst seenLast seenDNS
roberthalf.it 13 2025-08-19 2026-09-07 ok
*.roberthalf.it 13 2025-08-19 2026-09-07 —
pre-prod.roberthalf.it 8 2026-04-14 2026-08-11 ok
*.m.roberthalf.it 3 2025-08-19 2026-07-19 —
tags.roberthalf.it 2 2025-07-02 2026-06-02 ok
careers.roberthalf.it 10 2026-05-26 2026-09-23 ok
collect.roberthalf.it 2 2025-07-02 2026-06-02 ok
www.roberthalf.it 8 2026-04-25 2026-08-21 ok

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