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.

8 hosts · 281 ms

HostCertsFirst seenLast seenDNS
sts2-01.cloudbnc.ca 10 2025-12-12 2026-08-19 ok
sts-01.cloudbnc.ca 10 2025-12-12 2026-08-19 ok
sts2-02.cloudbnc.ca 10 2025-12-12 2026-08-19 ok
sts-02.cloudbnc.ca 10 2025-12-12 2026-08-19 ok
sts2.cloudbnc.ca 16 2025-12-12 2026-08-19 ok
sts-sign.cloudbnc.ca 1 2025-12-02 2025-12-02 nxdomain
sts.cloudbnc.ca 11 2025-12-02 2026-08-19 ok
sts-decrypt.cloudbnc.ca 1 2025-12-02 2025-12-02 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/cloudbnc.ca (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/cloudbnc.ca.