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.

4 hosts · 512 ms

Download CSV
HostCertsFirst seenLast seen
app.lucidchart.com 5 2026-01-10 2026-09-09
*.app.lucidchart.com 14 2025-09-30 2026-09-10
cdn-font-service-public.app.lucidchart.com 4 2026-06-02 2026-10-12
cdn-image-service.app.lucidchart.com 5 2026-05-26 2026-10-05

Programmatic access: API GET /v1/hosts/app.lucidchart.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/app.lucidchart.com.