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 · 303 ms

HostCertsFirst seenLast seenDNS
earlsrestaurants.com 9 2026-04-21 2026-09-14 ok
*.earlsrestaurants.com 9 2026-04-21 2026-09-14 —
tools.earlsrestaurants.com 1 2026-08-13 2026-08-13 ok
staging.tools.earlsrestaurants.com 2 2026-07-24 2026-09-17 ok
mta-sts.earlsrestaurants.com 2 2026-03-04 2026-08-04 ok
pay.earlsrestaurants.com 5 2026-05-27 2026-09-25 ok

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