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 · 325 ms

HostCertsFirst seenLast seenDNS
choco.app 1 2026-02-11 2026-02-11 nodata
*.choco.app 1 2026-02-11 2026-02-11 —
wiki.choco.app 6 2026-07-03 2026-08-31 ok
portal.choco.app 1 2025-11-12 2025-11-12 ok
light.choco.app 1 2025-11-12 2025-11-12 nxdomain
*.rest.choco.app 2 2025-11-27 2025-11-27 —

Programmatic access, with DNS A records: API GET /v1/hosts/choco.app (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/choco.app.