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.

19 hosts · 238 ms

HostCertsFirst seenLast seen
redx.com 5 2025-08-26 2026-08-14
*.redx.com 6 2025-08-26 2026-08-14
team-invite.redx.com 5 2026-05-24 2026-09-21
bmg.redx.com 1 2026-09-15 2026-09-15
portal.redx.com 12 2026-04-26 2026-08-22
email.academymail.redx.com 4 2026-04-22 2026-06-21
elasticgeo.redx.com 5 2026-06-06 2026-10-04
go.redx.com 8 2026-04-26 2026-08-23
brandbuilder.redx.com 1 2026-09-10 2026-09-10
identity-server.redx.com 5 2026-05-01 2026-08-28
signature-images.redx.com 7 2026-04-14 2026-09-21
pages.redx.com 6 2026-06-30 2026-08-28
coaches.redx.com 5 2026-05-19 2026-09-16
links.redx.com 4 2026-04-18 2026-08-31
multipass.redx.com 5 2026-04-22 2026-08-20
revenuecat-events.redx.com 5 2026-05-04 2026-09-01
academy.redx.com 16 2026-06-03 2026-09-29
university.redx.com 10 2026-06-04 2026-06-04
quiz.redx.com 5 2026-05-20 2026-09-17

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