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 · 232 ms

HostCertsFirst seenLast seen
r3mx.com 32 2026-04-25 2026-10-01
*.r3mx.com 27 2026-05-04 2026-10-01
prokore.r3mx.com 5 2026-05-09 2026-09-06
ah.r3mx.com 1 2026-04-16 2026-04-16
portal.r3mx.com 12 2026-05-07 2026-09-04
fl.r3mx.com 1 2026-08-14 2026-08-14
app.r3mx.com 3 2026-07-30 2026-09-28
tpsapp.r3mx.com 3 2026-04-20 2026-06-19
mail.tpsapp.r3mx.com 3 2026-04-20 2026-06-19
sir.r3mx.com 3 2026-07-30 2026-09-28
books.r3mx.com 10 2026-05-05 2026-09-02
accounts.r3mx.com 10 2026-05-05 2026-09-04
www.r3mx.com 5 2026-04-25 2026-08-23
velax.r3mx.com 2 2026-06-12 2026-06-12

Programmatic access: API GET /v1/hosts/r3mx.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/r3mx.com.