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 · 257 ms

HostCertsFirst seenLast seenDNS
muninova.co.jp 2 2026-03-05 2026-08-05 nodata
stg.muninova.co.jp 2 2026-02-20 2026-02-20 nxdomain
search.muninova.co.jp 1 2026-03-10 2026-03-10 ok
www.muninova.co.jp 4 2026-02-20 2026-08-05 ok

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