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.

21 hosts · 261 ms

HostCertsFirst seenLast seen
horze.com 38 2025-08-22 2026-10-13
*.horze.com 19 2025-08-22 2026-10-13
b2b.sta.horze.com 5 2026-06-12 2026-10-09
b2b.horze.com 5 2026-05-24 2026-09-21
rs0-0.prod.horze.com 1 2026-08-11 2026-08-11
rs0-1.prod.horze.com 1 2026-08-11 2026-08-11
rs0-2.prod.horze.com 1 2026-08-11 2026-08-11
pre.horze.com 5 2026-05-24 2026-09-20
static.img.horze.com 4 2026-04-16 2026-09-16
b2b.mailing.horze.com 3 2026-05-27 2026-08-11
trk.mail.horze.com 15 2026-04-18 2026-10-12
image.email.horze.com 3 2025-08-11 2026-07-20
gtm.horze.com 5 2026-06-07 2026-10-05
load.gtm.horze.com 8 2026-05-08 2026-09-03
promotion.horze.com 4 2026-07-06 2026-09-03
*.promotion.horze.com 4 2026-07-06 2026-09-03
cso.horze.com 5 2026-05-06 2026-09-03
wrkr.horze.com 10 2026-06-17 2026-10-13
*.wrkr.horze.com 10 2026-06-17 2026-10-13
cdn.usercontent.horze.com 2 2026-04-16 2026-09-16
www.horze.com 5 2026-05-23 2026-09-20

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