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.

10 hosts · 293 ms

HostCertsFirst seenLast seen
newbalance.ca 15 2025-10-13 2026-09-16
new-staging.newbalance.ca 19 2026-06-07 2026-10-03
img.email.newbalance.ca 14 2026-05-07 2026-09-02
link.email.newbalance.ca 21 2026-05-02 2026-08-30
stores.newbalance.ca 10 2026-04-18 2026-08-14
development.newbalance.ca 9 2025-07-24 2026-08-14
test.newbalance.ca 8 2026-04-24 2026-08-20
staging-test.newbalance.ca 12 2026-04-25 2026-08-21
dev.newbalance.ca 20 2025-07-24 2026-10-05
www.newbalance.ca 16 2025-10-13 2026-09-16

Programmatic access: API GET /v1/hosts/newbalance.ca (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.ca.