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.

7 hosts · 265 ms

HostCertsFirst seenLast seen
becker-floege.de 7 2026-06-16 2026-10-08
*.becker-floege.de 2 2026-04-17 2026-10-08
mcprod.becker-floege.de 6 2026-06-16 2026-10-07
mcstaging.becker-floege.de 4 2026-04-14 2026-08-12
kontaktlinsen.becker-floege.de 4 2026-06-08 2026-10-04
assets.becker-floege.de 5 2026-05-23 2026-09-20
www.becker-floege.de 6 2026-06-16 2026-10-07

Programmatic access: API GET /v1/hosts/becker-floege.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/becker-floege.de.