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 · 280 ms

HostCertsFirst seenLast seenDNS
zeitcontemporaryart.com 18 2026-05-14 2026-10-01 ok
*.zeitcontemporaryart.com 3 2026-09-23 2026-10-01 —
portal.zeitcontemporaryart.com 2 2026-09-28 2026-09-28 ok
www.zeitcontemporaryart.com 13 2026-05-14 2026-09-30 ok

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