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.

3 hosts · 302 ms

HostCertsFirst seenLast seenDNS
picnic.de 1 2025-12-02 2025-12-02 ok
*.picnic.de 1 2025-12-02 2025-12-02 —
click.picnic.de 2 2025-09-09 2026-08-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/picnic.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/picnic.de.