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 · 230 ms

HostCertsFirst seenLast seenDNS
lunrcapital.com 10 2026-05-11 2026-09-30 ok
*.lunrcapital.com 10 2026-05-11 2026-09-30 —
blog.lunrcapital.com 12 2026-04-17 2026-08-13 ok
assets.lunrcapital.com 2 2026-03-11 2026-07-24 ok
mta-sts.lunrcapital.com 5 2026-05-11 2026-09-11 ok
status.lunrcapital.com 5 2026-04-10 2026-10-05 ok

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