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.

8 hosts · 465 ms

Download CSV
HostCertsFirst seenLast seen
esrgear.com 11 2025-12-09 2026-08-28
*.esrgear.com 2 2025-12-09 2025-12-11
sso.esrgear.com 3 2026-06-10 2026-09-08
support.esrgear.com 10 2026-06-05 2026-10-04
devtest.esrgear.com 5 2026-05-24 2026-09-27
drawtest.esrgear.com 4 2026-06-07 2026-10-11
cryoboost.esrgear.com 2 2026-03-03 2026-07-19
www.esrgear.com 7 2026-04-20 2026-08-29

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