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 · 326 ms

HostCertsFirst seenLast seen
castlelakeservices.com 7 2026-04-13 2026-09-08
wildcard.castlelakeservices.com 6 2026-04-14 2026-09-21
www.wildcard.castlelakeservices.com 7 2026-04-14 2026-09-26
staging.castlelakeservices.com 7 2026-04-26 2026-08-30
whm.staging.castlelakeservices.com 5 2026-05-18 2026-09-08
api.castlelakeservices.com 7 2026-04-14 2026-09-15
lyncdiscoverinternal.castlelakeservices.com 6 2026-04-19 2026-09-27
www.lyncdiscoverinternal.castlelakeservices.com 7 2026-04-21 2026-09-26
m.castlelakeservices.com 1 2026-09-27 2026-09-27
app.castlelakeservices.com 7 2026-04-18 2026-09-16
lyncdiscover.castlelakeservices.com 7 2026-04-28 2026-09-17
www.lyncdiscover.castlelakeservices.com 9 2026-04-15 2026-09-20
secrets.castlelakeservices.com 1 2026-10-07 2026-10-07
mta-sts.castlelakeservices.com 6 2026-04-24 2026-09-20
www.mta-sts.castlelakeservices.com 5 2026-05-18 2026-09-15
app-global-test.castlelakeservices.com 5 2026-05-27 2026-09-12
dev.castlelakeservices.com 4 2026-04-15 2026-08-12
www.dev.castlelakeservices.com 7 2026-04-15 2026-07-26
www.castlelakeservices.com 7 2026-04-24 2026-09-24

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