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.

6 hosts · 289 ms

HostCertsFirst seenLast seenDNS
gmobb.jp 4 2026-04-06 2026-09-25 ok
*.gmobb.jp 4 2026-04-06 2026-09-25 —
afi.gmobb.jp 7 2026-04-24 2026-08-22 ok
afi.ssl.gmobb.jp 8 2026-04-12 2026-08-13 ok
affitown.gmobb.jp 1 2025-07-28 2025-07-28 nxdomain
lp.gmobb.jp 7 2026-04-21 2026-10-01 ok

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