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 · 281 ms

HostCertsFirst seenLast seenDNS
yell4george.com 22 2026-04-22 2026-10-01 ok
*.yell4george.com 8 2026-06-05 2026-10-01 —
link.yell4george.com 1 2026-09-10 2026-09-10 ok
www.yell4george.com 16 2026-04-24 2026-08-21 ok
pay.yell4george.com 1 2026-05-02 2026-05-02 ok
www.pay.yell4george.com 1 2026-05-02 2026-05-02 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/yell4george.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/yell4george.com.