Napster issues

I am having issues with Napster on my children's accounts.  They have Napster gift cards, and when they purchase a song from Napster, they are redirected to a url with a numeric IP address, like the following:

 

http://63.241.45.38/29541989.mp3?mob=AQEAQgAAAACAgO1BblwDE_oaRGVtaSBMb3ZhdG8gLSBDYXRjaCBNZS5tcDNEhhJbTZ4Bi44QRwAAAACaAgMAQ2XGwgGZGJ0J_CAyNTNiYTQ2YjAzZGNkZDExNzE4N2JiZjQyM2M5MDA3N_tIZHM9MjA3OCZmaXJzdD0yNzgmc2Vjb25kPTM5MyZmaWxlX2lkPTI3ODM5MzU5MyZzb25nX2lkPTI5NTQxOTg5JmV4dD0ubXAzzErXcveMZaACS44nSXqV9Q--&suf=.mp3

 

This comes up as uncategorized, and since I block uncategorized, the download fails, and they waste $1, unless I am able to unblock the URL quickly.

 

This is related to an issue I have reported before for other cases.  Basically, the URL should not be uncategorized, it should be categorized and allowed since the ip address above belongs to the napster.com domain, which I have allowed.