Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

12 hosts · 243 ms

HostCertsFirst seenLast seen
newbalance.co.uk 15 2025-09-12 2026-09-14
staging.newbalance.co.uk 14 2026-06-02 2026-09-28
link.email.newbalance.co.uk 15 2026-05-03 2026-09-28
stores.newbalance.co.uk 7 2026-06-05 2026-10-01
finderplus.newbalance.co.uk 19 2026-04-12 2026-10-06
staging-finderplus.newbalance.co.uk 14 2026-05-28 2026-09-23
test-finderplus.newbalance.co.uk 14 2026-05-17 2026-09-12
dev-finderplus.newbalance.co.uk 19 2025-07-24 2026-10-07
development.newbalance.co.uk 21 2025-07-24 2026-10-08
test.newbalance.co.uk 8 2026-05-16 2026-09-11
staging-test.newbalance.co.uk 12 2026-04-25 2026-08-21
www.newbalance.co.uk 21 2025-09-12 2026-10-06

Programmatic access: API GET /v1/hosts/newbalance.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/newbalance.co.uk.