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.

21 hosts · 220 ms

HostCertsFirst seenLast seen
powerdmarc.com 60 2026-04-26 2026-09-19
*.powerdmarc.com 42 2026-04-27 2026-09-19
mta-sts.rua.powerdmarc.com 2 2026-06-09 2026-08-19
mta-sts.ruf.powerdmarc.com 2 2026-06-09 2026-08-19
training.powerdmarc.com 11 2026-04-21 2026-09-22
changelog.powerdmarc.com 5 2026-05-27 2026-09-29
auth.powerdmarc.com 12 2026-04-22 2026-08-18
api.powerdmarc.com 4 2026-05-02 2026-06-30
cdn.powerdmarc.com 1 2026-02-02 2026-02-02
subscriptions.powerdmarc.com 10 2026-04-29 2026-08-27
mta-sts.powerdmarc.com 4 2026-04-21 2026-09-10
status.powerdmarc.com 10 2026-05-13 2026-09-11
aiassistant.powerdmarc.com 3 2026-02-05 2026-02-10
support.powerdmarc.com 7 2026-05-21 2026-09-16
ja.support.powerdmarc.com 8 2026-05-15 2026-09-11
de.support.powerdmarc.com 12 2026-05-15 2026-09-10
nl.support.powerdmarc.com 8 2026-05-15 2026-09-10
fr.support.powerdmarc.com 10 2026-05-16 2026-09-11
es.support.powerdmarc.com 10 2026-05-15 2026-09-10
ru.support.powerdmarc.com 10 2026-05-15 2026-09-11
www.powerdmarc.com 23 2026-04-26 2026-09-16

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