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.

14 hosts · 304 ms

HostCertsFirst seenLast seen
crisp.nl 3 2026-05-09 2026-08-28
mg.crisp.nl 4 2026-04-20 2026-08-18
mg.mail.crisp.nl 5 2026-04-26 2026-08-24
partner.crisp.nl 3 2026-05-14 2026-08-27
dev.partner.crisp.nl 7 2026-05-07 2026-09-23
*.dev.partner.crisp.nl 7 2026-05-07 2026-09-23
canary.partner.crisp.nl 3 2026-05-20 2026-09-07
for-hackers.crisp.nl 3 2026-05-07 2026-08-26
dev.test.crisp.nl 5 2026-04-22 2026-08-20
*.dev.test.crisp.nl 5 2026-04-22 2026-08-20
dev.crisp.nl 10 2026-05-10 2026-09-08
*.dev.crisp.nl 5 2026-05-11 2026-09-08
www.crisp.nl 5 2026-04-12 2026-09-23
canary.crisp.nl 3 2026-05-17 2026-09-03

Programmatic access: API GET /v1/hosts/crisp.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/crisp.nl.