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 · 284 ms

HostCertsFirst seenLast seenDNS
trade-island.jp 1 2025-12-04 2025-12-04 ok
*.trade-island.jp 4 2025-08-11 2026-09-01 —
stg.trade-island.jp 3 2025-10-01 2026-09-01 ok
*.stg.trade-island.jp 4 2025-07-01 2026-09-01 —
www.trade-island.jp 1 2025-12-04 2025-12-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/trade-island.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/trade-island.jp.