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 · 177 ms

HostCertsFirst seenLast seen
gaz.de 2 2025-12-18 2026-01-14
*.gaz.de 2 2025-12-18 2026-01-14
sw6.gaz.de 5 2026-05-18 2026-09-15
www.sw6.gaz.de 5 2026-05-18 2026-09-15
mta-sts.gaz.de 5 2026-05-08 2026-09-07

Programmatic access: API GET /v1/hosts/gaz.de (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/gaz.de.