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.

24 hosts · 283 ms

HostCertsFirst seenLast seen
serif.com 5 2025-11-04 2026-10-05
*.serif.com 7 2025-08-02 2026-10-05
page.service.serif.com 5 2026-03-23 2026-08-23
auth.service.serif.com 4 2026-03-24 2026-08-24
marketing-crm.service.serif.com 4 2025-07-23 2026-06-23
reviews.service.serif.com 4 2025-08-19 2026-07-20
content.service.serif.com 5 2025-09-29 2026-08-30
store.serif.com 3 2025-07-07 2026-06-07
affinity-update.serif.com 1 2026-01-24 2026-01-24
link.serif.com 1 2026-09-22 2026-09-22
dl.serif.com 2 2025-09-04 2026-08-19
cdn.serif.com 2 2025-07-14 2026-06-14
beta-downloads.serif.com 2 2025-09-16 2026-08-16
resources.serif.com 2 2026-03-17 2026-08-17
support.serif.com 4 2026-06-04 2026-10-02
test.support.serif.com 5 2026-04-22 2026-08-20
www.support.serif.com 5 2025-11-04 2026-10-05
affinity.serif.com 3 2025-07-07 2026-06-07
e.affinity.serif.com 10 2026-05-16 2026-09-11
blog.affinity.serif.com 8 2026-05-16 2026-09-11
email.affinity.serif.com 1 2026-05-16 2026-05-16
forum.affinity.serif.com 4 2025-11-13 2026-10-13
hello.affinity.serif.com 10 2026-05-16 2026-09-11
press.affinity.serif.com 5 2025-11-04 2026-10-05

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