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.

5 hosts · 374 ms

HostCertsFirst seenLast seenDNS
honcho.com 5 2025-08-22 2026-07-27 ok
*.honcho.com 5 2025-08-22 2026-07-27 —
api.honcho.com 1 2025-08-26 2025-08-26 nodata
hr.honcho.com 8 2026-05-16 2026-09-13 ok
www.honcho.com 2 2025-08-26 2026-07-27 ok

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