Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

17 hosts · 216 ms

HostCertsFirst seenLast seen
link.ai 12 2026-03-07 2026-09-18
*.link.ai 7 2025-09-15 2026-08-16
beta.link.ai 4 2026-06-08 2026-10-07
onboarding.link.ai 5 2026-04-25 2026-08-29
staging.link.ai 4 2026-06-09 2026-10-07
auth.link.ai 10 2026-04-26 2026-08-23
api.link.ai 5 2026-05-06 2026-09-04
staging-api.link.ai 5 2026-04-28 2026-08-26
tool.link.ai 1 2026-06-11 2026-06-11
*.tool.link.ai 1 2026-06-11 2026-06-11
staging.tool.link.ai 3 2026-05-06 2026-10-06
*.staging.tool.link.ai 3 2026-05-06 2026-10-06
app.link.ai 2 2026-06-08 2026-06-08
*.app.link.ai 2 2026-06-08 2026-06-08
signup.link.ai 2 2026-07-16 2026-07-16
status.link.ai 1 2026-04-18 2026-04-18
www.link.ai 7 2026-05-06 2026-09-18

Programmatic access: API GET /v1/hosts/link.ai (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/link.ai.