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 · 313 ms

HostCertsFirst seenLast seenDNS
wpbeginner.com 34 2025-09-30 2026-09-30 ok
*.wpbeginner.com 34 2025-09-30 2026-09-30 —
secure.el1.wpbeginner.com 8 2026-05-22 2026-09-19 ok
track.sl.wpbeginner.com 8 2026-04-19 2026-08-17 ok
tools.wpbeginner.com 5 2026-04-26 2026-08-24 ok
*.videos.wpbeginner.com 12 2026-05-31 2026-09-26 —
clients.wpbeginner.com 6 2026-06-07 2026-06-07 nxdomain

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