T-SQL WHILE Loop and CAST

-- DEMO WHILE Loop and CAST
DECLARE @ip1 varchar(15), @ip1start int
SET @ip1 = '10.3.21.'
SET @ip1start = 131

WHILE (@ip1start<255)
BEGIN
--PRINT 'test'
PRINT @ip1 + CAST(@ip1start as varchar(3))

SET @ip1start = @ip1start + 1
END

GO