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 · 293 ms

HostCertsFirst seenLast seenDNS
cloud.sfmc.dukeenergy.com 2 2025-09-21 2026-08-09 ok
image.sfmc.dukeenergy.com 57 2025-09-21 2026-08-29 ok
click.sfmc.dukeenergy.com 3 2025-09-21 2026-08-10 ok
view.sfmc.dukeenergy.com 2 2025-09-21 2026-08-09 ok

Programmatic access, with DNS A records: API GET /v1/hosts/sfmc.dukeenergy.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/sfmc.dukeenergy.com.