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.

4 hosts · 232 ms

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HostCertsFirst seenLast seen
cloud.email.teamusa.com 1 2026-01-06 2026-01-06
image.email.teamusa.com 2 2025-11-26 2026-01-22
click.email.teamusa.com 1 2026-01-01 2026-01-01
view.email.teamusa.com 1 2026-01-01 2026-01-01

Programmatic access: API GET /v1/hosts/email.teamusa.com (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/email.teamusa.com.