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.

5 hosts · 209 ms

HostCertsFirst seenLast seenDNS
newsletter.cbc.be 1 2025-12-08 2025-12-08 ok
m3.newsletter.cbc.be 1 2025-12-08 2025-12-08 ok
res3.newsletter.cbc.be 1 2025-12-08 2025-12-08 ok
t3.newsletter.cbc.be 1 2025-12-08 2025-12-08 ok
www.newsletter.cbc.be 1 2025-12-08 2025-12-08 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/newsletter.cbc.be (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/newsletter.cbc.be.