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.

14 hosts · 267 ms

HostCertsFirst seenLast seenDNS
aeonmobile.jp 5 2025-07-22 2026-08-07 ok
*.aeonmobile.jp 5 2025-07-22 2026-09-13 —
hiroba.aeonmobile.jp 6 2025-07-29 2026-09-14 ok
stg.aeonmobile.jp 4 2026-04-20 2026-08-19 ok
fcm-relay-stg.aeonmobile.jp 4 2026-04-12 2026-09-20 ok
mikan.aeonmobile.jp 4 2026-04-17 2026-08-17 ok
campaign.aeonmobile.jp 4 2026-04-17 2026-08-17 ok
faq.aeonmobile.jp 2 2025-06-13 2026-06-29 ok
www.faq.aeonmobile.jp 1 2025-06-13 2025-06-13 nxdomain
contact.aeonmobile.jp 1 2026-08-05 2026-08-05 ok
fcm-relay.aeonmobile.jp 3 2026-05-09 2026-08-23 ok
happy.aeonmobile.jp 4 2026-07-16 2026-09-07 ok
stg.happy.aeonmobile.jp 4 2026-07-16 2026-09-10 ok
biz.aeonmobile.jp 5 2026-04-15 2026-09-18 ok

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