a builtin function called PARSENAME can do this for you...irt was designed to parse dbname.owner.table.columnname, but works greate for IPs:
declare @val varchar(20)
set @val='192.168.1.100'
select parsename(@val,4),parsename(@val,3),parsename(@val,2),parsename(@val,1)
192 168 1 100
Lowell
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