Quick I don't mind... dirty I hate.

I often find that when people post their problem they over sanitize their examples and therefore cannot build code on a silver platter that will work in all instances. THat, and others may adopt this code later, only to be bitten by the shortcomings.

Short of an array, the string could include delimiters that prevent false positives.

untested
Code:
$third = '~'+Trim(Split(@IPADDRESS0,".")[2])+'~'
Select
    Case InStr('~153~154~155~254~206~190~196~216~',$third)
    $CENTER = "BRK" 
EndSelect
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.