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.

6 hosts · 243 ms

HostCertsFirst seenLast seen
civicnews.org 22 2026-04-23 2026-09-19
*.civicnews.org 9 2026-04-23 2026-09-05
scim.civicnews.org 3 2026-06-07 2026-08-06
mta-sts.civicnews.org 2 2026-05-28 2026-08-07
mccfw.civicnews.org 11 2026-05-23 2026-09-19
www.civicnews.org 2 2026-06-09 2026-08-10

Programmatic access: API GET /v1/hosts/civicnews.org (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/civicnews.org.