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.

16 hosts · 329 ms

HostCertsFirst seenLast seenDNS
gaikaex.com 2 2026-04-21 2026-04-21 ok
*.gaikaex.com 1 2026-04-21 2026-04-21 —
upload.gaikaex.com 1 2026-04-21 2026-04-21 ok
cfd.gaikaex.com 1 2025-11-04 2025-11-04 ok
mypage.gaikaex.com 1 2026-04-21 2026-04-21 ok
faq.gaikaex.com 1 2026-04-21 2026-04-21 ok
account.gaikaex.com 1 2025-11-04 2025-11-04 ok
opt.gaikaex.com 1 2026-04-21 2026-04-21 ok
maintenance.opt.gaikaex.com 2 2026-04-25 2026-09-25 ok
inhouse.opt.gaikaex.com 2 2026-04-08 2026-09-08 ok
stgopt.gaikaex.com 1 2026-04-21 2026-04-21 ok
*.stgopt.gaikaex.com 2 2026-03-26 2026-08-26 —
maintenance.stgopt.gaikaex.com 2 2026-04-10 2026-09-10 ok
support.gaikaex.com 1 2026-04-21 2026-04-21 ok
www.gaikaex.com 1 2026-04-21 2026-04-21 ok
fx.gaikaex.com 1 2026-04-21 2026-04-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/gaikaex.com (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/gaikaex.com.