Tags for MAC address

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Imported from previous forum

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Hi,

 

I am developing trading system that can process FIX protocol message.

This system currently process sender's IP address with Tag11001(It's not standard value).

The problem is that I have to make additional function processing MAC address but there's no standard Tag for MAC address.

So, I want to know there is formal or informal Tag for MAC address or how your system process sender's IP or Mac address.

 

Thanks for your help.