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.

20 hosts · 272 ms

HostCertsFirst seenLast seen
phaidoninternational.com 3 2026-05-02 2026-10-02
*.phaidoninternational.com 3 2026-05-02 2026-10-02
hub.phaidoninternational.com 7 2026-05-17 2026-09-12
learning.phaidoninternational.com 2 2025-09-04 2026-08-05
ai.phaidoninternational.com 3 2026-02-27 2026-09-10
qa.ai.phaidoninternational.com 1 2026-09-10 2026-09-10
dev.ai.phaidoninternational.com 3 2026-02-13 2026-09-15
myhorizon.phaidoninternational.com 3 2026-05-15 2026-09-28
qa.myhorizon.phaidoninternational.com 3 2026-05-15 2026-09-27
dev.myhorizon.phaidoninternational.com 3 2026-05-12 2026-09-23
labs.phaidoninternational.com 1 2026-05-15 2026-05-15
qa.labs.phaidoninternational.com 1 2026-05-15 2026-05-15
calc.labs.phaidoninternational.com 1 2026-05-19 2026-05-19
dev.labs.phaidoninternational.com 3 2026-05-01 2026-09-09
resources.phaidoninternational.com 3 2026-04-28 2026-08-18
timesheets.phaidoninternational.com 3 2025-09-17 2026-10-06
www.timesheets.phaidoninternational.com 1 2025-09-17 2025-09-17
talent.phaidoninternational.com 5 2026-04-23 2026-09-08
trust.phaidoninternational.com 10 2026-05-12 2026-09-07
sw.phaidoninternational.com 2 2025-09-23 2026-08-24

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