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.

17 hosts · 254 ms

HostCertsFirst seenLast seenDNS
jfx.co.jp 3 2025-11-17 2026-02-24 nodata
*.jfx.co.jp 1 2025-11-17 2025-11-17 —
ade.jfx.co.jp 3 2026-04-27 2026-09-27 ok
stg2-registration.jfx.co.jp 4 2026-03-04 2026-07-22 ok
info.jfx.co.jp 4 2026-03-04 2026-07-22 ok
faq.jfx.co.jp 1 2026-01-13 2026-01-13 ok
matrixtrader.jfx.co.jp 2 2026-03-02 2026-10-01 ok
stg-matrixtrader.jfx.co.jp 3 2026-03-02 2026-10-01 ok
api01.stg-matrixtrader.jfx.co.jp 1 2026-05-12 2026-05-12 ok
demo-matrixtrader.jfx.co.jp 3 2026-03-02 2026-10-01 ok
api01.demo-matrixtrader.jfx.co.jp 1 2026-05-22 2026-05-22 ok
api01.matrixtrader.jfx.co.jp 1 2026-05-22 2026-05-22 ok
fx.stg-beginner.jfx.co.jp 2 2026-03-09 2026-09-10 ok
fx.beginner.jfx.co.jp 2 2026-03-06 2026-09-07 ok
register.jfx.co.jp 4 2026-03-04 2026-07-22 ok
www.jfx.co.jp 4 2026-03-04 2026-07-22 ok
stg.www.jfx.co.jp 4 2026-03-04 2026-07-22 ok

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