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.

10 hosts · 293 ms

HostCertsFirst seenLast seen
catfootwear.com 2 2025-10-09 2026-09-09
stg.catfootwear.com 14 2026-05-25 2026-09-20
loadteststg.catfootwear.com 20 2026-05-27 2026-09-23
cloud.email.catfootwear.com 1 2026-02-08 2026-02-08
image.email.catfootwear.com 4 2026-03-30 2026-09-29
click.email.catfootwear.com 1 2026-02-08 2026-02-08
view.email.catfootwear.com 1 2026-02-08 2026-02-08
gtm.catfootwear.com 3 2026-05-18 2026-08-31
loadtest.catfootwear.com 16 2026-05-13 2026-09-08
www.catfootwear.com 24 2026-05-06 2026-09-01

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