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.

10 hosts · 322 ms

HostCertsFirst seenLast seenDNS
condenast.jp 42 2025-09-19 2026-09-10 ok
*.condenast.jp 22 2025-09-19 2026-09-10 —
c.condenast.jp 5 2025-12-29 2025-12-29 ok
qc.condenast.jp 10 2025-09-23 2026-08-24 ok
archive-mb-live.condenast.jp 14 2026-05-19 2026-09-15 ok
*.stg.condenast.jp 3 2025-09-19 2026-08-19 —
link.condenast.jp 6 2026-06-03 2026-10-01 ok
events.condenast.jp 4 2026-04-17 2026-08-15 ok
*.dev.condenast.jp 3 2025-09-19 2026-08-19 —
www.condenast.jp 14 2026-05-01 2026-08-27 ok

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