在线根据mac查厂家链接

http://standards.ieee.org/develop/regauth/oui/public.html
格式：

如果mac地址为：acf7-f358-3f1b
那么只需要输入acf7f3或者ac-f7-f3
如：

Here are the results of your search through the public section of the IEEE Standards OUI database report for acf7f3:

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  AC-F7-F3   (hex)		XIAOMI CORPORATION ACF7F3 (base 16)		XIAOMI CORPORATION
  				Quanshitiandi Tower A,12th Floor, Jia 50 Wangjing Xilu
				Chaoyang Dist
				Beijing 100102
				CHINA

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Your attention is called to the fact that the firms and numbers listed may not always be obvious in product implementation.  Some manufacturers subcontract component manufacture and others include registered firms' OUIs in their products.