Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

2 hosts · 208 ms

HostCertsFirst seenLast seen
mta-sts.uniqlo.co.jp 1 2026-01-22 2026-01-22
www.uniqlo.co.jp 1 2026-04-06 2026-04-06

Programmatic access: API GET /v1/hosts/uniqlo.co.jp (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/uniqlo.co.jp.