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.

9 hosts · 258 ms

HostCertsFirst seenLast seenDNS
yamap.co.jp 1 2025-12-23 2025-12-23 ok
*.yamap.co.jp 5 2025-11-26 2025-12-23 —
client-vpn-endpoint.corp-infra.yamap.co.jp 1 2025-11-21 2025-11-21 nxdomain
bvf824ata4uf.yamap.co.jp 3 2026-04-30 2026-08-14 ok
email.yamap.co.jp 10 2026-04-28 2026-08-20 ok
cdn.yamap.co.jp 2 2025-06-12 2026-05-13 ok
corp.yamap.co.jp 5 2026-04-22 2026-09-30 ok
beginner.yamap.co.jp 2 2025-08-16 2026-07-15 ok
cdn-dev.yamap.co.jp 2 2025-06-12 2026-05-13 ok

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