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.

7 hosts · 276 ms

HostCertsFirst seenLast seenDNS
proppit.com 4 2025-08-19 2026-07-22 ok
*.proppit.com 6 2025-07-19 2026-07-22 —
blog.proppit.com 4 2026-04-21 2026-08-19 ok
info.proppit.com 10 2026-04-24 2026-08-20 ok
app.proppit.com 6 2026-06-02 2026-09-27 ok
dev.proppit.com 4 2025-08-22 2026-08-16 ok
*.dev.proppit.com 6 2025-07-10 2026-08-16 —

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