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.

2 hosts · 206 ms

HostCertsFirst seenLast seenDNS
click.jrebank.jp 1 2025-12-25 2025-12-25 ok
www.jrebank.jp 9 2025-09-12 2026-09-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/jrebank.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/jrebank.jp.