rangeOffset := calculateRangeOffset(cidr)
	offsetAddress, err := addOffsetAddress(ipFirst, uint64(rangeOffset))
	if err != nil {
		return nil, err
	}
	a := &Allocator{
		cidr:            cidr,
		prefix:          prefix,
		firstAddress:    ipFirst,
		lastAddress:     ipLast,
		rangeOffset:     rangeOffset,
		offsetAddress:   offsetAddress,
		size:            size,
		family:          family,

		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := addOffsetAddress(tt.address, tt.offset)
			if !reflect.DeepEqual(got, tt.want) || err != nil {
				t.Errorf("offsetAddress() = %v, want %v", got, tt.want)
			}
			// double check to avoid mistakes on the hardcoded values
			// avoid large numbers or it will timeout the test
			if tt.offset < 2048 {
				want := tt.address