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 · 210 ms

HostCertsFirst seenLast seen
image.e.krogermail.com 4 2026-01-07 2026-09-28
click.e.krogermail.com 2 2025-07-16 2026-07-03
pages.e.krogermail.com 3 2026-03-18 2026-08-19
view.e.krogermail.com 2 2025-07-16 2026-07-03

Programmatic access: API GET /v1/hosts/e.krogermail.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/e.krogermail.com.