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.

4 hosts · 226 ms

HostCertsFirst seenLast seenDNS
buchwald.com 2 2025-06-11 2026-05-12 ok
portfolio.buchwald.com 5 2026-05-22 2026-09-20 ok
staging.portfolio.buchwald.com 5 2026-05-18 2026-09-17 ok
www.buchwald.com 2 2025-06-11 2026-05-12 ok

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