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.

8 hosts · 295 ms

HostCertsFirst seenLast seenDNS
arcana-energy.co.jp 18 2026-04-15 2026-09-23 ok
*.arcana-energy.co.jp 7 2026-04-15 2026-09-23 —
gamma.arcana-energy.co.jp 6 2026-04-18 2026-08-15 ok
bb.arcana-energy.co.jp 4 2026-04-14 2026-08-12 ok
mypage.arcana-energy.co.jp 5 2026-05-29 2026-09-27 ok
multi.arcana-energy.co.jp 3 2026-05-04 2026-08-19 ok
axis.arcana-energy.co.jp 5 2026-04-30 2026-08-28 ok
assets.arcana-energy.co.jp 11 2026-05-21 2026-09-16 ok

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