Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

4 hosts · 264 ms

HostCertsFirst seenLast seenDNS
cloud.mail.milwaukeetool.eu 1 2026-01-31 2026-01-31 ok
image.mail.milwaukeetool.eu 2 2026-02-07 2026-06-25 ok
click.mail.milwaukeetool.eu 1 2026-02-08 2026-02-08 ok
view.mail.milwaukeetool.eu 1 2026-02-08 2026-02-08 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mail.milwaukeetool.eu (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/mail.milwaukeetool.eu.