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.

2 hosts · 315 ms

HostCertsFirst seenLast seenDNS
sdevops-cloud.com 3 2026-05-02 2026-10-02 ok
sohsl-cloudfront.sdevops-cloud.com 2 2025-06-26 2026-05-27 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/sdevops-cloud.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/sdevops-cloud.com.