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 · 256 ms

HostCertsFirst seenLast seenDNS
allydealer.com 1 2026-08-13 2026-08-13 ok
rvlg.allydealer.com 2 2025-06-16 2026-06-12 ok
www.rvlg.allydealer.com 2 2025-06-16 2026-06-12 nxdomain
quotes.allydealer.com 1 2026-01-28 2026-01-28 ok
www.quotes.allydealer.com 1 2026-01-28 2026-01-28 nxdomain

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