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.

18 hosts · 461 ms

HostCertsFirst seenLast seenDNS
woodward.edu 33 2026-04-30 2026-09-22 ok
*.woodward.edu 17 2026-04-30 2026-09-22 —
store.woodward.edu 12 2026-05-08 2026-09-04 ok
give.woodward.edu 14 2026-05-14 2026-09-09 ok
blog.woodward.edu 10 2026-04-23 2026-08-19 ok
link.woodward.edu 5 2026-04-26 2026-08-24 ok
helpdesk.woodward.edu 8 2026-04-20 2026-08-16 ok
mitel.woodward.edu 6 2026-04-11 2026-09-05 ok
info.woodward.edu 6 2026-04-23 2026-08-19 ok
cp.woodward.edu 2 2026-03-25 2026-09-10 ok
www.cp.woodward.edu 1 2026-03-25 2026-03-25 nxdomain
sts.woodward.edu 1 2026-02-23 2026-02-23 ok
mta-sts.woodward.edu 1 2026-02-23 2026-02-23 ok
www.mta-sts.woodward.edu 1 2026-02-23 2026-02-23 nxdomain
www.sts.woodward.edu 1 2026-02-23 2026-02-23 nxdomain
ruckus.woodward.edu 2 2026-03-23 2026-09-10 ok
www.ruckus.woodward.edu 1 2026-03-23 2026-03-23 ok
www.woodward.edu 17 2026-05-08 2026-09-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/woodward.edu (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/woodward.edu.