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.

10 hosts · 356 ms

HostCertsFirst seenLast seenDNS
securecontrolsframework.com 19 2026-04-14 2026-09-20 ok
*.securecontrolsframework.com 8 2026-05-24 2026-09-20 —
store.securecontrolsframework.com 2 2026-04-13 2026-09-13 ok
testsite.securecontrolsframework.com 11 2026-05-28 2026-09-23 ok
swag.securecontrolsframework.com 8 2026-04-23 2026-09-27 ok
training.securecontrolsframework.com 16 2026-04-30 2026-08-26 ok
forms.securecontrolsframework.com 12 2026-04-21 2026-08-20 ok
content.securecontrolsframework.com 5 2026-05-14 2026-09-13 ok
www.securecontrolsframework.com 12 2026-04-14 2026-08-10 ok
survey.securecontrolsframework.com 9 2026-07-22 2026-09-22 ok

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