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.

4 hosts · 260 ms

HostCertsFirst seenLast seenDNS
onestrokeinks.com 3 2026-03-15 2026-08-29 ok
dev.onestrokeinks.com 2 2026-07-24 2026-07-24 ok
www.dev.onestrokeinks.com 2 2026-07-24 2026-07-24 nxdomain
www.onestrokeinks.com 3 2026-03-15 2026-08-29 ok

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