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.

21 hosts · 294 ms

HostCertsFirst seenLast seen
zerodensity.io 6 2025-12-23 2026-09-23
*.zerodensity.io 6 2025-12-23 2026-09-23
cdn.zerodensity.io 4 2026-04-16 2026-08-14
vpn.zerodensity.io 5 2026-05-08 2026-09-04
*.vpn.zerodensity.io 5 2026-05-08 2026-09-04
learn.zerodensity.io 5 2026-05-11 2026-09-08
*.learn.zerodensity.io 5 2026-05-11 2026-09-08
demo.zerodensity.io 5 2026-05-02 2026-08-30
*.demo.zerodensity.io 5 2026-05-02 2026-08-30
shop.zerodensity.io 4 2026-04-19 2026-08-17
*.shop.zerodensity.io 4 2026-04-19 2026-08-17
docs.zerodensity.io 2 2026-01-21 2026-06-12
track.sl.downloads.zerodensity.io 7 2026-04-20 2026-08-21
resources.zerodensity.io 9 2026-04-17 2026-06-15
support.zerodensity.io 5 2026-05-13 2026-09-10
*.support.zerodensity.io 5 2026-05-13 2026-09-10
shoptest.zerodensity.io 5 2026-05-11 2026-09-08
*.shoptest.zerodensity.io 5 2026-05-11 2026-09-08
academy.zerodensity.io 4 2026-06-08 2026-10-06
*.academy.zerodensity.io 4 2026-06-08 2026-10-06
track.sl.academy.zerodensity.io 7 2026-04-19 2026-08-17

Programmatic access: API GET /v1/hosts/zerodensity.io (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/zerodensity.io.