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.

7 hosts · 286 ms

HostCertsFirst seenLast seen
newbalance.com.tw 19 2025-10-13 2026-09-16
staging.newbalance.com.tw 12 2026-05-30 2026-09-26
link.email.newbalance.com.tw 16 2026-05-22 2026-09-30
development.newbalance.com.tw 29 2025-07-24 2026-09-23
test.newbalance.com.tw 10 2026-04-24 2026-08-20
staging-test.newbalance.com.tw 12 2026-04-24 2026-08-20
www.newbalance.com.tw 14 2025-10-13 2026-09-16

Programmatic access: API GET /v1/hosts/newbalance.com.tw (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.com.tw.