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 · 273 ms

HostCertsFirst seenLast seenDNS
cds.newsletter-cdiscount.com 3 2026-01-30 2026-07-02 ok
m.cds.newsletter-cdiscount.com 3 2026-01-30 2026-07-02 ok
res.cds.newsletter-cdiscount.com 3 2026-01-30 2026-07-02 ok
t.cds.newsletter-cdiscount.com 3 2026-01-30 2026-07-02 ok

Programmatic access, with DNS A records: API GET /v1/hosts/cds.newsletter-cdiscount.com (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/cds.newsletter-cdiscount.com.