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 · 219 ms

HostCertsFirst seenLast seen
glas.agency 4 2026-06-04 2026-10-02
stagingarea.glas.agency 4 2026-06-07 2026-10-05
rs.glas.agency 5 2026-05-20 2026-09-22
documents.glas.agency 2 2026-03-16 2026-10-06
www.glas.agency 4 2026-06-04 2026-10-02

Programmatic access: API GET /v1/hosts/glas.agency (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/glas.agency.