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.

17 hosts · 263 ms

HostCertsFirst seenLast seen
roark.com 24 2026-05-10 2026-09-26
*.roark.com 20 2026-05-10 2026-09-26
ca.roark.com 7 2026-04-22 2026-09-01
mparticle.roark.com 1 2026-02-04 2026-02-04
ss3.zone.roark.com 5 2026-05-12 2026-09-09
ss.zone.roark.com 4 2026-04-26 2026-06-25
lgdpf.roark.com 9 2026-05-29 2026-09-24
ai.roark.com 3 2026-05-16 2026-09-01
vip.roark.com 13 2026-04-19 2026-10-01
refer.roark.com 2 2025-10-22 2026-09-22
account.roark.com 14 2026-04-19 2026-10-01
vip-account.roark.com 16 2026-04-22 2026-10-05
support.roark.com 10 2026-05-09 2026-09-04
au.roark.com 13 2026-05-18 2026-09-26
t.au.roark.com 4 2026-04-20 2026-08-18
jitsu.roark.com 3 2026-05-03 2026-08-24
www.roark.com 13 2026-05-11 2026-09-21

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