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.

7 hosts · 312 ms

HostCertsFirst seenLast seenDNS
gistworld.com 3 2026-02-19 2026-10-03 ok
*.gistworld.com 1 2026-02-18 2026-02-18 —
subcon.gistworld.com 1 2026-02-18 2026-02-18 ok
vpn.gistworld.com 3 2026-02-26 2026-09-07 ok
pp.gistworld.com 2 2026-02-25 2026-06-17 ok
*.test.gistworld.com 3 2026-06-05 2026-09-23 —
www.gistworld.com 2 2026-02-25 2026-06-18 ok

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