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.

6 hosts · 213 ms

HostCertsFirst seenLast seenDNS
bppulse.email 18 2026-05-12 2026-10-02 ok
*.bppulse.email 18 2026-05-12 2026-10-02 —
cloud.bppulse.email 1 2026-01-12 2026-01-12 servfail
image.bppulse.email 2 2026-01-21 2026-06-25 ok
click.bppulse.email 1 2026-01-12 2026-01-12 ok
view.bppulse.email 1 2026-01-13 2026-01-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/bppulse.email (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/bppulse.email.