The following query will enable you to list all the tables in your database that doesn’t have an IDENTITY Column:
SELECT SysSchemas.name + N'.' + SysTables.name FROM sys.tables AS SysTables INNER JOIN sys.schemas AS SysSchemas ON SysTables.[schema_id] = SysSchemas.[schema_id] WHERE NOT EXISTS ( SELECT 1 FROM sys.identity_columns AS IDCol WHERE IDCol.[object_id] = SysTables.[object_id] );