[{"mac_prefix":"BC:31:98:50","mask_bits":28,"block_type":"MA-M","organization":"Hunan Gukam Railway Equipment Co.,Ltd","address":"Room603, Building E4, Yunlong HeadQuarters Economic Park, No.5099 Yunlong Avenue, Yunlong Demonstration Zone, Zhuzhou City Zhuzhou  CN 430200","country":"CN"}]