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 · 281 ms

HostCertsFirst seenLast seenDNS
prozis.com 14 2026-04-27 2026-10-03 ok
*.prozis.com 14 2026-04-27 2026-10-03 —
a.prozis.com 2 2026-08-25 2026-08-25 nxdomain
cdn.blog.prozis.com 4 2026-04-16 2026-09-03 ok
email.prozis.com 4 2026-04-12 2026-08-10 ok
assets.prozis.com 14 2026-08-25 2026-08-26 ok

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