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 · 335 ms

HostCertsFirst seenLast seenDNS
joyce.edu 16 2026-01-26 2026-10-02 ok
*.joyce.edu 10 2026-01-26 2026-10-02 —
mediaspace.joyce.edu 12 2026-05-31 2026-09-27 ok
catalog.joyce.edu 30 2025-10-30 2026-09-17 ok
wifi.joyce.edu 2 2026-10-01 2026-10-01 nxdomain
www.wifi.joyce.edu 2 2026-10-01 2026-10-01 nxdomain
portal.joyce.edu 24 2026-05-12 2026-09-10 ok
em.joyce.edu 8 2026-05-08 2026-09-03 ok
orientation.joyce.edu 5 2026-05-14 2026-09-10 ok
go.joyce.edu 10 2026-04-26 2026-08-23 ok
old-go.joyce.edu 2 2026-08-12 2026-08-12 ok
help.joyce.edu 11 2026-05-20 2026-09-15 ok
www.joyce.edu 6 2026-05-24 2026-09-27 ok
my.joyce.edu 4 2026-05-31 2026-10-05 ok
flow.my.joyce.edu 3 2026-05-24 2026-09-14 ok

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