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 · 234 ms

HostCertsFirst seenLast seenDNS
zurichssi.co.jp 38 2025-09-28 2026-10-06 nodata
*.zurichssi.co.jp 37 2025-09-28 2026-10-03 —
aemetrics1.zurichssi.co.jp 1 2025-11-24 2025-11-24 ok
chatbot-api.zurichssi.co.jp 1 2026-01-15 2026-01-15 ok
chatbot.zurichssi.co.jp 1 2026-01-15 2026-01-15 ok

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