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.

15 hosts · 262 ms

HostCertsFirst seenLast seen
sandmarc.com 15 2026-05-15 2026-09-24
ae.sandmarc.com 13 2026-05-16 2026-09-24
de.sandmarc.com 12 2026-05-16 2026-09-20
link.sandmarc.com 5 2026-05-08 2026-09-05
cn.sandmarc.com 15 2026-05-15 2026-09-26
jp.sandmarc.com 13 2026-05-16 2026-09-25
server.sandmarc.com 4 2026-04-24 2026-10-08
fr.sandmarc.com 15 2026-05-16 2026-09-23
es.sandmarc.com 13 2026-05-16 2026-09-26
sms.sandmarc.com 8 2026-05-10 2026-09-05
it.sandmarc.com 13 2026-05-16 2026-09-27
account.sandmarc.com 15 2026-04-21 2026-10-02
www.sandmarc.com 14 2026-05-15 2026-09-28
pay.sandmarc.com 1 2026-05-02 2026-05-02
www.pay.sandmarc.com 1 2026-05-02 2026-05-02

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