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.

22 hosts · 185 ms

HostCertsFirst seenLast seen
safe.security 40 2026-04-15 2026-09-03
*.safe.security 19 2026-01-08 2026-08-30
em7396.safe.security 2 2026-07-29 2026-07-29
ddb0a0c2-da30-43fa-ac4b-e71372bd0159.safe.security 8 2026-04-16 2026-08-12
circle.safe.security 11 2025-12-14 2026-08-15
testdrive.safe.security 16 2026-03-26 2026-10-08
service.desk.safe.security 2 2026-03-12 2026-07-28
sl.safe.security 5 2026-05-11 2026-09-08
go.safe.security 16 2026-05-28 2026-09-23
tprmdemo.safe.security 5 2026-03-23 2026-06-16
jobs.safe.security 9 2026-04-26 2026-09-26
docs.safe.security 10 2026-04-27 2026-08-24
pages.safe.security 14 2026-05-26 2026-08-12
mta-sts.safe.security 13 2025-07-18 2026-09-05
testdrive-uat.safe.security 2 2026-03-26 2026-08-26
tprm-uat.safe.security 1 2026-03-23 2026-03-23
net.safe.security 10 2026-05-08 2026-09-04
support.safe.security 2 2026-03-12 2026-07-28
www.safe.security 24 2026-04-14 2026-10-09
my.safe.security 4 2026-05-11 2026-07-10
academy.safe.security 3 2026-05-04 2026-06-10
email.mail.academy.safe.security 3 2026-06-05 2026-06-05

Programmatic access: API GET /v1/hosts/safe.security (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/safe.security.