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.

9 hosts · 319 ms

HostCertsFirst seenLast seen
onescore.app 1 2025-12-04 2025-12-04
*.onescore.app 1 2025-12-04 2025-12-04
check.onescore.app 4 2025-09-07 2026-10-09
www.check.onescore.app 2 2026-10-09 2026-10-09
network.onescore.app 1 2025-12-05 2025-12-05
lnk.em.onescore.app 11 2025-09-26 2026-09-26
www.lnk.em.onescore.app 4 2025-09-26 2026-09-26
tpp.onescore.app 4 2025-10-12 2026-09-11
tppdev.onescore.app 2 2025-07-31 2026-06-30

Programmatic access: API GET /v1/hosts/onescore.app (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/onescore.app.