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.

19 hosts · 234 ms

HostCertsFirst seenLast seen
mailsoar.com 4 2026-04-20 2026-08-14
preprod.mailsoar.com 3 2026-06-25 2026-08-22
www.preprod.mailsoar.com 3 2026-06-25 2026-08-22
teampulse.mailsoar.com 3 2026-05-25 2026-08-03
www.teampulse.mailsoar.com 3 2026-05-25 2026-08-03
refonte.mailsoar.com 5 2026-04-16 2026-10-07
www.refonte.mailsoar.com 5 2026-04-16 2026-10-07
check.mailsoar.com 1 2026-09-22 2026-09-22
www.check.mailsoar.com 1 2026-09-22 2026-09-22
mail.mailsoar.com 4 2026-04-20 2026-08-14
gtm.mailsoar.com 5 2026-04-26 2026-08-25
images.mailsoar.com 5 2026-05-09 2026-09-02
www.images.mailsoar.com 5 2026-05-09 2026-09-02
test.mailsoar.com 8 2026-06-07 2026-10-03
dev.mailsoar.com 2 2026-06-12 2026-06-12
www.dev.mailsoar.com 2 2026-06-12 2026-06-12
www.mailsoar.com 4 2026-04-20 2026-08-14
inbox.mailsoar.com 6 2026-05-21 2026-09-23
www.inbox.mailsoar.com 6 2026-05-21 2026-09-23

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