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Information about the central database for US toll free number management.
http://www.sms800.com/
PageRank: 0/10
Detailed information on the history and current developments in North American NPA allocations.
http://www.areacode-info.com/
PageRank: 0/10
A collection of all international numbering plans in the world. Some features require a paid subscription.
http://www.numberingplans.com/
PageRank: 0/10