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.

17 hosts · 407 ms

HostCertsFirst seenLast seenDNS
redroof.com 4 2025-09-07 2026-07-20 ok
*.redroof.com 6 2025-07-13 2026-07-20 —
save.redroof.com 10 2026-04-28 2026-09-25 ok
asportal.redroof.com 2 2026-02-23 2026-06-17 ok
ca.info.redroof.com 1 2026-01-21 2026-01-21 ok
e.info.redroof.com 1 2026-01-21 2026-01-21 ok
preferences.info.redroof.com 10 2026-05-15 2026-09-10 ok
images.info.redroof.com 1 2026-01-21 2026-01-21 ok
view.info.redroof.com 1 2026-01-21 2026-01-21 ok
images.redroof.com 1 2026-05-09 2026-05-09 ok
ag-certtest.redroof.com 1 2026-09-07 2026-09-07 ok
ca.my.redroof.com 1 2026-01-21 2026-01-21 ok
e.my.redroof.com 1 2026-01-21 2026-01-21 ok
images.my.redroof.com 1 2026-01-21 2026-01-21 ok
view.my.redroof.com 1 2026-01-21 2026-01-21 ok
redacademy.redroof.com 4 2025-09-02 2026-08-25 ok
www.redacademy.redroof.com 4 2025-09-02 2026-08-25 nxdomain

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