question: private byte [ ] [ ] extractIPsAndSubnetMasks ( byte [ ] ipWithSubmask1 , byte [ ] ipWithSubmask2 ) { int ipLength = ipWithSubmask1 . length / 2 ; byte ip1 [ ] = new byte [ ipLength ] ; byte subnetmask1 [ ] = new byte [ ipLength ] ; System . arraycopy ( ipWithSubmask1 , 0 , ip1 , 0 , ipLength ) ; System . arraycopy ( ipWithSubmask1 , ipLength , subnetmask1 , 0 , ipLength ) ; byte ip2 [ ] = new byte [ ipLength ] ; byte subnetmask2 [ ] = new byte [ ipLength ] ; System . arraycopy ( ipWithSubmask2 , 0 , ip2 , 0 , ipLength ) ; System . arraycopy ( ipWithSubmask2 , ipLength , subnetmask2 , 0 , ipLength ) ; return new byte [ ] [ ] { ip1 , subnetmask1 , ip2 , subnetmask2 } ; }
target:  Splits the IP addresses and their subnet mask.