Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

9 hosts · 369 ms

HostCertsFirst seenLast seenDNS
pulze.com 4 2026-04-07 2026-08-24 ok
*.pulze.com 4 2026-04-07 2026-08-24 —
login.staging.pulze.com 6 2026-01-13 2026-09-15 ok
login.pulze.com 3 2026-05-15 2026-09-28 ok
qr.pulze.com 2 2026-02-24 2026-06-16 ok
stms.pulze.com 3 2026-05-17 2026-09-01 ok
link.mail.it.pulze.com 9 2026-05-05 2026-09-15 ok
blueprint.pulze.com 5 2026-05-31 2026-09-28 ok
login.test.pulze.com 6 2026-01-17 2026-09-15 ok

Programmatic access, with DNS A records: API GET /v1/hosts/pulze.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/pulze.com.