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 · 472 ms

HostCertsFirst seenLast seen
cloud.mailer.lemonaidhealth.com 1 2025-08-01 2025-08-01
image.mailer.lemonaidhealth.com 2 2025-07-12 2026-07-30
click.mailer.lemonaidhealth.com 1 2025-08-01 2025-08-01
view.mailer.lemonaidhealth.com 1 2025-08-01 2025-08-01

Programmatic access: API GET /v1/hosts/mailer.lemonaidhealth.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/mailer.lemonaidhealth.com.