In reply to bmorris:
You can do
bins OtherIp ={[0:MAXVALUE]} with (!(item inside {DUT_IP, routeIp[0], routeIp[1], routeIp[2], routeIp[3]}));
Note that if routelp is an array of 4 values, you can do
cp_DstIp : coverpoint arp_txn.dIP {
bins dut_IP = {DUT_IP};
bins routableIp[]= routeIp;
bins OtherIp = {[0:MAXVALUE]} with (!(item inside {DUT_IP, routeIp}));
}