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 · 292 ms

HostCertsFirst seenLast seenDNS
dmarcmanager.eu 1 2026-08-21 2026-08-21 ok
web.dmarcmanager.eu 1 2026-08-26 2026-08-26 ok
mta-sts.dmarcmanager.eu 1 2026-08-12 2026-08-12 ok
www.dmarcmanager.eu 1 2026-08-21 2026-08-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/dmarcmanager.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/dmarcmanager.eu.