Exchange codes

I am trying to add futures symbols to amibroker from iqfeed. I know how to add them and I know for instance to add gold continuous chart to enter QGC#, Q being the commex code. I can find the futures symbols but what I am having trouble finding is the exchange symbols like Q for Comex. What are the exchange symbols for the other exchanges? CME for example. Where can I find this information? Sorry to post such a basic question but I cannot find this info anywhere on this forum or on the internet. Thank you! Neil

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The post is from 2017, but the link still works.