What this means
The IEEE assigned the MA-M block EC9F0DB to CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTITUTE CO.,LTD. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting EC:9F:0D:B, it is CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTITUTE CO.,LTD hardware.
Frequently Asked Questions
Who owns MAC prefix EC9F0DB?
EC9F0DB is registered to CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTITUTE CO.,LTD in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTITUTE CO.,LTD's block covers 1,048,576 addresses.
What devices use EC9F0DB?
Any network device with a MAC address starting EC:9F:0D:B was manufactured by or for CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTITUTE CO.,LTD.