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 · 211 ms

HostCertsFirst seenLast seenDNS
01bank.co.jp 5 2025-08-25 2026-09-09 ok
*.01bank.co.jp 2 2026-03-30 2026-08-30 —
stg.01bank.co.jp 2 2025-07-17 2026-06-17 ok
www.01bank.co.jp 7 2026-03-06 2026-09-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/01bank.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/01bank.co.jp.