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 · 244 ms

HostCertsFirst seenLast seenDNS
marks-and-spencer.com 1 2025-12-01 2025-12-01 ok
autodiscover.marks-and-spencer.com 3 2025-10-13 2026-09-16 ok
flowersubscriptions.marks-and-spencer.com 1 2025-12-12 2025-12-12 nxdomain
www.flowersubscriptions.marks-and-spencer.com 1 2025-12-12 2025-12-12 nxdomain
www.marks-and-spencer.com 1 2025-12-01 2025-12-01 ok

Programmatic access, with DNS A records: API GET /v1/hosts/marks-and-spencer.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/marks-and-spencer.com.