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.

7 hosts · 298 ms

HostCertsFirst seenLast seenDNS
ddsdiscounts.com 3 2026-02-04 2026-10-05 ok
stage.ddsdiscounts.com 12 2026-04-18 2026-08-15 ok
*.mailing.ddsdiscounts.com 2 2025-06-26 2026-05-27 —
links.mailing.ddsdiscounts.com 1 2026-10-05 2026-10-05 ok
jobs.ddsdiscounts.com 4 2026-02-12 2026-09-27 ok
dev.ddsdiscounts.com 10 2026-04-17 2026-08-13 ok
www.ddsdiscounts.com 2 2026-02-04 2026-10-04 ok

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