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.

10 hosts · 353 ms

HostCertsFirst seenLast seenDNS
therealest.com 4 2025-07-06 2026-09-10 ok
*.therealest.com 4 2025-07-06 2026-09-10 —
brand.therealest.com 1 2025-11-21 2025-11-21 ok
shipping.therealest.com 5 2026-05-11 2026-09-08 ok
ohtani.therealest.com 1 2026-07-10 2026-07-10 ok
vpn.therealest.com 1 2026-01-29 2026-01-29 ok
develop.therealest.com 2 2026-03-25 2026-08-25 ok
*.develop.therealest.com 2 2026-03-25 2026-08-25 —
vpn.develop.therealest.com 1 2026-01-22 2026-01-22 ok
support.therealest.com 5 2026-05-09 2026-09-06 ok

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