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.

5 hosts · 251 ms

HostCertsFirst seenLast seenDNS
ruralis.com 7 2025-06-15 2026-09-21 ok
*.ruralis.com 13 2025-06-15 2026-09-21 —
book.ruralis.com 6 2026-05-10 2026-09-07 ok
*.book.ruralis.com 1 2026-08-07 2026-08-07 —
invest.ruralis.com 12 2026-04-09 2026-10-03 ok

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