You can search LiveATC to see what feeds are available. Just go to the home page and enter in search parameters in the top left hand side of the page. For example, if you want to see if there are any feeds for Albuquerque Center, just enter ZAB in the search box. If you want to know if a specific frequency is covered, just enter that frequency. That's the easiest way to see what feeds are available.
Ron
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