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.

5 hosts · 238 ms

HostCertsFirst seenLast seen
intercert.com 11 2025-07-21 2026-08-29
*.intercert.com 10 2025-07-21 2026-08-12
newadmin.intercert.com 1 2026-09-17 2026-09-17
mta-sts.intercert.com 3 2026-04-24 2026-09-14
www.intercert.com 1 2026-08-29 2026-08-29

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