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 · 301 ms

HostCertsFirst seenLast seenDNS
protiviti.co.uk 3 2025-10-10 2026-07-21 ok
timesheet.protiviti.co.uk 2 2025-09-09 2026-01-21 ok
dev-timesheet.protiviti.co.uk 5 2025-08-14 2026-09-09 ok
www.protiviti.co.uk 3 2025-10-10 2026-07-21 ok

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