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func Search(mac string) (result string) {
	defer func() {
		if r := recover(); r != nil {
			result = ""
		}
	}()
	s := strings.Split(strings.ToUpper(mac), ":")
	bint := b2uint64(s)
	
	var keyFirstFloor []int
	for b := range d {
		keyFirstFloor = append(keyFirstFloor, b)
	}
	sort.Sort(sort.Reverse(sort.IntSlice(keyFirstFloor)))

	for _, b := range keyFirstFloor {
		k := 48 - b
		bint = (bint >> uint8(k)) << uint8(k)
		if _, ok := d[b].(map[uint64]string)[bint]; ok {
			return d[b].(map[uint64]string)[bint]
		}
	}
	return ""
}