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.

15 hosts · 283 ms

HostCertsFirst seenLast seenDNS
fncu.org 41 2026-04-08 2026-09-23 ok
*.fncu.org 10 2026-04-13 2026-09-23 —
msx2010.fncu.org 6 2026-04-08 2026-09-23 nxdomain
msx2016.fncu.org 6 2026-04-08 2026-09-23 nxdomain
msx2019.fncu.org 6 2026-04-08 2026-09-23 nxdomain
rasweb.fncu.org 14 2026-04-20 2026-09-12 ok
raspc.fncu.org 9 2026-04-20 2026-09-12 ok
secure.fncu.org 6 2026-04-08 2026-09-23 ok
email.fncu.org 1 2026-04-22 2026-04-22 ok
autodiscover.fncu.org 6 2026-04-08 2026-09-23 ok
ras.fncu.org 11 2026-04-15 2026-09-11 ok
svr01xpapexs.fncu.org 4 2026-05-29 2026-07-24 nxdomain
www.fncu.org 11 2025-06-24 2026-09-08 ok
ax.fncu.org 3 2026-06-15 2026-08-14 nxdomain
apply.fncu.org 4 2025-08-29 2026-09-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/fncu.org (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/fncu.org.