CrowdStrike classifies a host as Inactive when its sensor has not contacted the cloud for more than 30 days. The platform keeps that inactive-host record for one additional retention period; after 90 days from the last sensor check-in the record is automatically purged from the Falcon console and database. Therefore, the default retention interval for inactive sensors is 90 days.

A. 30 days – 30 days merely defines when a host becomes “Inactive”; it is not the purge interval.
B. 365 days – No CrowdStrike document specifies a one-year automatic removal of inactive sensors.
C. 45 days – 45 days is not used in Falcon host-retention logic; sensors remain visible well past this point.

1. CrowdStrike Falcon Console User Guide v6.0, “Hosts App – Host Status”, p. 112–113: “Inactive … Host records are retained for 90 days and then removed automatically.”

2. CrowdStrike Support Knowledge Base Article CS-10697 “Falcon Host Removal Policy”, rev. 2022-07-15, para. 2: “Hosts that have not checked in for 90 days are deleted by default.”

3. CrowdStrike University CCFA-200 Courseware, Module 2 “Falcon UI & Administration”, slide 14: “Inactive sensors (no check-in >30 days) are purged after 90 days.”