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.

18 hosts · 267 ms

HostCertsFirst seenLast seen
plexapp.com 16 2026-04-23 2026-10-03
thetvdb.plexapp.com 18 2026-04-18 2026-09-30
prod.plexapp.com 18 2026-04-15 2026-10-09
lastfm-prod.plexapp.com 5 2026-05-28 2026-08-31
plexmovie.plexapp.com 18 2026-04-15 2026-09-20
me.plexapp.com 20 2026-04-15 2026-09-20
elan.plexapp.com 10 2026-04-15 2026-08-11
geo.plexapp.com 12 2026-04-15 2026-08-11
downloads.plexapp.com 13 2026-05-17 2026-09-22
nightlies.plexapp.com 13 2026-05-17 2026-09-22
files.plexapp.com 10 2026-04-15 2026-08-11
tvthemes.plexapp.com 10 2026-04-15 2026-08-11
forums.plexapp.com 13 2026-05-18 2026-09-22
mta-sts.plexapp.com 6 2026-05-02 2026-08-28
support.plexapp.com 9 2026-05-17 2026-09-22
www.plexapp.com 16 2026-04-18 2026-09-21
my.plexapp.com 5 2026-04-19 2026-08-17
lastfm-z.plexapp.com 15 2026-04-15 2026-08-30

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