Iowa Code Title XVI. Criminal Law and Procedure [Chs. 687-916] § 804.2. Contents of arrest warrant

The warrant must be directed to any peace officer in the state; give the name of the defendant, if known to the magistrate; if unknown, may designate “name unknown”; and must state by name or general description an offense which authorizes a warrant to issue, the date of issuing it, the county or city where issued, and be signed by the magistrate with the magistrate's name of office.