Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

4 hosts · 224 ms

HostCertsFirst seenLast seenDNS
schuldnerberatung-schulz.de 10 2025-07-01 2026-09-10 ok
mx0.schuldnerberatung-schulz.de 1 2026-04-10 2026-04-10 ok
www.mx0.schuldnerberatung-schulz.de 1 2026-04-10 2026-04-10 nxdomain
www.schuldnerberatung-schulz.de 10 2025-07-01 2026-09-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/schuldnerberatung-schulz.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/schuldnerberatung-schulz.de.