Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
720-542 9 Denver CO 318J COMCAST IP PHONE, LLC 656   2007-09-21   
720-550 6 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-08-27   
720-550 7 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-08-27   
720-550 8 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-08-27   
720-572 4 Denver CO 318J COMCAST IP PHONE, LLC 656   2017-01-31   
720-572 5 Denver CO 318J COMCAST IP PHONE, LLC 656   2017-01-31   
720-572 7 Denver CO 318J COMCAST IP PHONE, LLC 656   2017-01-31   
720-573 3 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-12-02   
720-573 4 Denver CO 318J COMCAST IP PHONE, LLC 656   2015-01-08   
720-573 6 Denver CO 318J COMCAST IP PHONE, LLC 656   2015-03-13   
720-573 8 Denver CO 318J COMCAST IP PHONE, LLC 656   2015-10-10   
720-573 9 Denver CO 318J COMCAST IP PHONE, LLC 656   2015-03-13   
720-583 0 Denver CO 318J COMCAST IP PHONE, LLC 656   2010-12-16   
720-583 1 Denver CO 318J COMCAST IP PHONE, LLC 656   2011-01-04   
720-583 2 Denver CO 318J COMCAST IP PHONE, LLC 656   2011-01-04   
720-583 6 Denver CO 318J COMCAST IP PHONE, LLC 656   2011-01-04   
720-592 0 Denver CO 318J COMCAST IP PHONE, LLC 656   2017-02-11   
720-592 1 Denver CO 318J COMCAST IP PHONE, LLC 656   2017-02-11   
720-595 3 Denver CO 318J COMCAST IP PHONE, LLC 656   2017-02-14   
720-596 4 Denver CO 318J COMCAST IP PHONE, LLC 656      
720-598 5 Denver CO 318J COMCAST IP PHONE, LLC 656   2015-04-28   
720-598 6 Denver CO 318J COMCAST IP PHONE, LLC 656   2015-04-28   
720-600 5 Longmont CO 318J COMCAST IP PHONE, LLC 656   2013-10-29   
720-603 4 Denver CO 318J COMCAST IP PHONE, LLC 656   2017-11-19   
720-609 2 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-07-21   
720-612 4 Denver CO 318J COMCAST IP PHONE, LLC 656   2012-07-01   
720-612 7 Denver CO 318J COMCAST IP PHONE, LLC 656   2012-07-01   
720-614 5 Denver CO 318J COMCAST IP PHONE, LLC 656   2018-12-17   
720-616 7 Denver CO 318J COMCAST IP PHONE, LLC 656   2015-06-03   
720-627 5 Denver CO 318J COMCAST IP PHONE, LLC 656   2012-11-21   
720-630 7 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-07-08   
720-630 8 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-07-08   
720-634 4 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-09-18   
720-638 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-638 0 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-638 1 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-638 2 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-638 3 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-638 4 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-638 5 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-638 6 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-638 7 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-638 8 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-638 9 Denver CO 318J COMCAST IP PHONE, LLC 656   2013-03-17   
720-639 2 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-07-15   
720-639 3 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-07-15   
720-639 4 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-07-15   
720-639 5 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-07-15   
720-639 6 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-07-15   
720-639 9 Denver CO 318J COMCAST IP PHONE, LLC 656   2014-07-15   

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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