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.

8 hosts · 321 ms

HostCertsFirst seenLast seenDNS
lzo.com 2 2025-12-22 2026-09-01 ok
1786.lzo.com 1 2026-08-31 2026-08-31 ok
psd2-xs2a.lzo.com 5 2025-09-02 2026-08-24 nxdomain
gewinnspiele.lzo.com 1 2026-08-31 2026-08-31 ok
module.lzo.com 2 2026-01-09 2026-09-01 ok
mailing.lzo.com 5 2026-05-01 2026-08-30 ok
tixxt.lzo.com 5 2026-04-27 2026-08-25 ok
www.lzo.com 2 2026-01-09 2026-09-01 ok

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