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.

6 hosts · 287 ms

HostCertsFirst seenLast seen
snowtrex.com 5 2025-07-28 2026-09-14
*.snowtrex.com 1 2025-08-25 2025-08-25
images.snowtrex.com 2 2026-08-05 2026-10-05
news.snowtrex.com 4 2026-04-12 2026-08-10
www.snowtrex.com 4 2025-07-28 2026-09-14
my.snowtrex.com 4 2026-02-15 2026-09-30

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