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.

14 hosts · 279 ms

HostCertsFirst seenLast seen
edthena.com 29 2026-04-23 2026-10-05
*.edthena.com 25 2026-04-23 2026-10-05
wiki.edthena.com 3 2026-09-30 2026-09-30
api.edthena.com 11 2026-05-27 2026-09-22
edtpa-certification.edthena.com 6 2026-05-13 2026-09-08
info.edthena.com 3 2026-06-12 2026-09-06
moreinfo.edthena.com 5 2026-06-01 2026-09-17
*.moreinfo.edthena.com 5 2026-06-01 2026-09-17
app.edthena.com 13 2026-05-26 2026-09-22
ideas.edthena.com 7 2026-05-08 2026-09-05
socialtools.edthena.com 10 2026-05-25 2026-09-24
support.edthena.com 4 2026-04-20 2026-08-18
www.edthena.com 4 2026-06-04 2026-10-02
edtpa-lockbox.edthena.com 10 2026-05-30 2026-09-25

Programmatic access: API GET /v1/hosts/edthena.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/edthena.com.