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.

2 hosts · 309 ms

HostCertsFirst seenLast seenDNS
lclngroup.com 1 2026-05-21 2026-05-21 ok
www.lclngroup.com 1 2026-05-21 2026-05-21 ok

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