Federal Land Asset Inventory Reform Act of 2021 This bill directs the Department of the Interior and the Forest Service to develop and maintain a current and accurate multipurpose cadastre (inventory) of federal real property under their jurisdictions to support federal land management activities on federal real property, including resource development and conservation and agricultural use. Interior and the Forest Service shall report on (1) existing real property inventories or any components of any cadastre of federal real property, (2) consolidation of inventories and components, (3) the use of existing inventories and components of any cadastre, (4) cost savings that will be achieved, (5) a plan for implementation of this bill, and (6) recommendations for legislation. Interior and the Forest Service shall (1) make the multipurpose cadastre publicly available on the Internet; and (2) ensure that such cadastre includes the identification of all lands suitable for disposal and the appraised value of the land, if an appraisal has been conducted pursuant to the Federal Land Policy and Management Act of 1976.