Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

9 hosts · 226 ms

Download CSV
HostCertsFirst seenLast seen
ds-01.athletics.ucf.edu 1 2025-09-11 2025-09-11
ntnxfl1.athletics.ucf.edu 1 2025-09-22 2025-09-22
rs-02.athletics.ucf.edu 1 2025-09-08 2025-09-08
owa.athletics.ucf.edu 1 2025-11-04 2025-11-04
ntnxpe.athletics.ucf.edu 1 2025-09-22 2025-09-22
thor.athletics.ucf.edu 1 2026-05-01 2026-05-01
ds.athletics.ucf.edu 1 2025-09-08 2025-09-08
mta-sts.athletics.ucf.edu 5 2026-05-30 2026-09-27
knugget.athletics.ucf.edu 2 2026-04-22 2026-05-08

Programmatic access: API GET /v1/hosts/athletics.ucf.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/athletics.ucf.edu.