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.

3 hosts · 235 ms

HostCertsFirst seenLast seenDNS
montblanc.co.kr 8 2026-04-13 2026-09-23 ok
stories.montblanc.co.kr 8 2026-04-13 2026-09-23 ok
www.montblanc.co.kr 8 2026-04-13 2026-09-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/montblanc.co.kr (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/montblanc.co.kr.