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.

4 hosts · 224 ms

HostCertsFirst seenLast seen
e-mail.asnbank.nl 1 2026-02-23 2026-02-23
m.e-mail.asnbank.nl 1 2026-02-23 2026-02-23
res.e-mail.asnbank.nl 1 2026-02-23 2026-02-23
t.e-mail.asnbank.nl 1 2026-02-23 2026-02-23

Programmatic access: API GET /v1/hosts/e-mail.asnbank.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/e-mail.asnbank.nl.