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 · 226 ms

HostCertsFirst seenLast seen
tradeacademy.nl 10 2026-03-07 2026-09-07
ai.tradeacademy.nl 3 2026-06-27 2026-08-28
email.tradeacademy.nl 5 2026-06-01 2026-09-29
links.tradeacademy.nl 4 2026-06-08 2026-10-06
www.tradeacademy.nl 21 2026-03-07 2026-09-07

Programmatic access: API GET /v1/hosts/tradeacademy.nl (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/tradeacademy.nl.