Get all SQL Server tables that have IDENTITY enabled

Here is a useful script. If you need to find out tables that have Identity property enabled, you can simply query the sys.tables Catalog View combining with OBJECTPROPERTY function.

USE AdventureWorks2014;
GO

SELECT SCHEMA_NAME(schema_id) + '.' + name TableName 
FROM sys.tables
WHERE OBJECTPROPERTY(object_id, 'TableHasIdentity') = 1;

Remember, this OBJECTPROPERTY function can be used to check many properties related to SQL Server objects. See this MSDN page for more details on it;

https://msdn.microsoft.com/en-us/library/ms176105.aspx