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.

3 hosts · 240 ms

HostCertsFirst seenLast seenDNS
newsbreakmail.com 4 2025-06-22 2026-09-08 ok
*.newsbreakmail.com 5 2025-06-22 2026-09-29 —
rs-stripe.newsbreakmail.com 5 2026-05-03 2026-08-31 ok

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