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.

8 hosts · 270 ms

Download CSV
HostCertsFirst seenLast seen
thompson-morgan.com 16 2026-05-06 2026-10-12
*.thompson-morgan.com 16 2026-05-06 2026-10-12
reporting.thompson-morgan.com 1 2026-06-09 2026-06-09
blog.thompson-morgan.com 5 2025-07-24 2026-10-13
link.thompson-morgan.com 4 2026-04-20 2026-08-18
mailhost.thompson-morgan.com 1 2025-10-21 2025-10-21
www.mailhost.thompson-morgan.com 1 2025-10-21 2025-10-21
www.thompson-morgan.com 4 2026-04-21 2026-09-16

Programmatic access: API GET /v1/hosts/thompson-morgan.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/thompson-morgan.com.