question: private Set intersectIPRange ( byte [ ] ipWithSubmask1 , byte [ ] ipWithSubmask2 ) { if ( ipWithSubmask1 . length != ipWithSubmask2 . length ) { return Collections . EMPTY_SET ; } byte [ ] [ ] temp = extractIPsAndSubnetMasks ( ipWithSubmask1 , ipWithSubmask2 ) ; byte ip1 [ ] = temp [ 0 ] ; byte subnetmask1 [ ] = temp [ 1 ] ; byte ip2 [ ] = temp [ 2 ] ; byte subnetmask2 [ ] = temp [ 3 ] ; byte minMax [ ] [ ] = minMaxIPs ( ip1 , subnetmask1 , ip2 , subnetmask2 ) ; byte [ ] min ; byte [ ] max ; max = min ( minMax [ 1 ] , minMax [ 3 ] ) ; min = max ( minMax [ 0 ] , minMax [ 2 ] ) ; if ( compareTo ( min , max ) == 1 ) { return Collections . EMPTY_SET ; } byte [ ] ip = or ( minMax [ 0 ] , minMax [ 2 ] ) ; byte [ ] subnetmask = or ( subnetmask1 , subnetmask2 ) ; return Collections . singleton ( ipWithSubnetMask ( ip , subnetmask ) ) ; }
target:  Calculates the interesction if two IP ranges.