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.

5 hosts · 166 ms

HostCertsFirst seenLast seen
justflyemail.com 9 2026-05-23 2026-09-24
*.justflyemail.com 9 2026-05-23 2026-09-24
image.email.justflyemail.com 4 2025-10-08 2026-09-01
click.email.justflyemail.com 1 2025-11-07 2025-11-07
view.email.justflyemail.com 1 2025-11-06 2025-11-06

Programmatic access: API GET /v1/hosts/justflyemail.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/justflyemail.com.