func (m *OuiDb) Lookup(address HardwareAddr) *AddressBlock {
	for _, block := range m.Blocks {
		if block.Contains(address) {
			return &block
		}
	}

	return nil
}
func (m *OuiDb) Lookup(address HardwareAddr) *AddressBlock {
	for _, block := range m.Blocks {
		if block.Contains(address) {
			return &block
		}
	}

	return nil
}
// Lookup finds the OUI the address belongs to