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.

13 hosts · 238 ms

HostCertsFirst seenLast seenDNS
*.m2j.co.jp 23 2025-06-23 2026-09-15 —
qa.m2j.co.jp 3 2025-07-04 2026-07-06 ok
upload.m2j.co.jp 1 2025-11-28 2025-11-28 ok
toraripi.m2j.co.jp 3 2026-02-02 2026-02-02 ok
stg1toraripi.m2j.co.jp 3 2026-02-17 2026-02-17 ok
stg2toraripi.m2j.co.jp 3 2026-02-17 2026-02-17 ok
cloud.mail.m2j.co.jp 1 2026-05-15 2026-05-15 ok
image.mail.m2j.co.jp 4 2026-04-07 2026-09-14 ok
click.mail.m2j.co.jp 1 2026-05-15 2026-05-15 ok
view.mail.m2j.co.jp 1 2026-05-15 2026-05-15 ok
pr.m2j.co.jp 3 2026-05-22 2026-09-06 ok
stg1pr.m2j.co.jp 3 2026-07-28 2026-09-19 ok
www.m2j.co.jp 2 2025-10-29 2025-10-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/m2j.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/m2j.co.jp.