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 · 290 ms

HostCertsFirst seenLast seen
trainimal.com 1 2025-11-17 2025-11-17
ptonline.trainimal.com 1 2025-11-17 2025-11-17
corporate.trainimal.com 2 2025-08-05 2026-07-07
shop.trainimal.com 1 2025-11-17 2025-11-17
support.trainimal.com 9 2025-11-17 2026-09-13
www.trainimal.com 1 2025-11-17 2025-11-17

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