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.

7 hosts · 324 ms

HostCertsFirst seenLast seenDNS
creditspring.co.uk 6 2025-06-10 2026-07-08 ok
mill.creditspring.co.uk 4 2026-05-26 2026-07-26 ok
help.creditspring.co.uk 5 2026-05-31 2026-09-29 ok
app.creditspring.co.uk 6 2025-06-10 2026-09-16 ok
fp.app.creditspring.co.uk 6 2026-06-30 2026-08-28 ok
sms.creditspring.co.uk 2 2026-08-05 2026-08-05 ok
www.creditspring.co.uk 5 2026-05-06 2026-07-08 ok

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