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.

12 hosts · 447 ms

HostCertsFirst seenLast seenDNS
aflac-ads.co.jp 5 2026-05-17 2026-09-15 ok
staging.aflac-ads.co.jp 5 2026-05-06 2026-09-03 ok
www.staging.aflac-ads.co.jp 5 2026-05-06 2026-09-03 ok
adaas-roleplaying.aflac-ads.co.jp 1 2025-10-29 2025-10-29 servfail
*.adaas-roleplaying.aflac-ads.co.jp 1 2025-10-29 2025-10-29 —
accounts-stg.aflac-ads.co.jp 3 2026-05-25 2026-08-03 ok
ganportalafdstg.aflac-ads.co.jp 2 2026-03-03 2026-07-16 ok
api.aflac-ads.co.jp 1 2025-12-01 2025-12-01 ok
accounts.aflac-ads.co.jp 4 2026-04-28 2026-09-15 ok
ganportaldevtest.aflac-ads.co.jp 4 2026-02-14 2026-09-29 ok
commonid-frontside-dev.aflac-ads.co.jp 1 2026-09-04 2026-09-04 nodata
www.aflac-ads.co.jp 5 2026-05-17 2026-09-15 ok

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