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.

9 hosts · 232 ms

Download CSV
HostCertsFirst seenLast seen
comboink.com 5 2026-05-06 2026-10-06
url2344.comboink.com 2 2026-09-10 2026-09-10
alpha.comboink.com 4 2026-05-02 2026-10-04
theta.comboink.com 4 2026-05-02 2026-10-04
blog.comboink.com 2 2025-09-17 2026-08-18
app.comboink.com 2 2025-10-05 2026-09-05
assets.comboink.com 1 2026-01-21 2026-01-21
support.comboink.com 5 2026-05-20 2026-09-17
www.comboink.com 5 2026-05-06 2026-10-06

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