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.

5 hosts · 202 ms

HostCertsFirst seenLast seen
dustin.be 13 2025-09-07 2026-10-04
*.dustin.be 13 2025-09-07 2026-10-04
newdustineer.dustin.be 5 2026-04-30 2026-08-26
deals.dustin.be 5 2026-05-16 2026-09-05
solutions.dustin.be 5 2026-05-25 2026-09-22

Programmatic access: API GET /v1/hosts/dustin.be (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/dustin.be.