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.

15 hosts · 256 ms

HostCertsFirst seenLast seen
arborxr.com 22 2026-06-03 2026-10-03
*.arborxr.com 16 2026-05-05 2026-09-30
public-staging-storage.arborxr.com 9 2026-06-03 2026-09-29
form.arborxr.com 5 2026-05-25 2026-09-22
app.arborxr.com 4 2026-05-27 2026-09-24
updates.arborxr.com 6 2026-05-02 2026-08-28
developers.arborxr.com 4 2026-04-21 2026-08-19
wordpress.arborxr.com 4 2026-06-16 2026-07-04
status.arborxr.com 6 2026-05-31 2026-10-05
content.arborxr.com 10 2026-06-10 2026-10-07
network-test.arborxr.com 6 2026-05-23 2026-09-20
webflow.arborxr.com 10 2026-05-22 2026-09-17
www.arborxr.com 11 2026-06-06 2026-10-02
directory.arborxr.com 4 2026-04-21 2026-08-19
community.arborxr.com 11 2026-06-05 2026-10-01

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