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 · 303 ms

HostCertsFirst seenLast seenDNS
tuipartners.com 6 2026-01-20 2026-06-18 ok
portal.tuipartners.com 1 2026-05-11 2026-05-11 ok
static.portal.tuipartners.com 1 2026-05-11 2026-05-11 ok
tuipartners.tuipartners.com 2 2026-05-05 2026-05-05 nxdomain
www.tuipartners.com 6 2026-01-20 2026-06-18 ok

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