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 · 251 ms

HostCertsFirst seenLast seenDNS
vzde.com 4 2026-04-09 2026-08-07 ok
securemail.vzde.com 5 2026-05-02 2026-08-30 ok
sip.vzde.com 1 2025-07-11 2025-07-11 nxdomain
mta-sts.vzde.com 3 2026-04-12 2026-09-01 ok
vzdbde.zv.vzde.com 2 2025-07-10 2025-11-06 nxdomain
www.vzde.com 4 2026-04-09 2026-08-07 ok

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