Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-498 1 Denver CO 9636 QWEST CORPORATION 656   2006-12-04   
303-498 2 Denver CO 9636 QWEST CORPORATION 656   2007-06-15   
303-498 3 Denver CO 9636 QWEST CORPORATION 656   2007-06-15   
303-498 4 Denver CO 9636 QWEST CORPORATION 656   2007-07-06   
303-498 6 Denver CO 9636 QWEST CORPORATION 656   2007-07-06   
303-637 A Denver CO 9636 QWEST CORPORATION 656      
303-654 A Denver CO 9636 QWEST CORPORATION 656      
303-655 A Denver CO 9636 QWEST CORPORATION 656      
303-659 A Denver CO 9636 QWEST CORPORATION 656      
303-835 5 Denver CO 9636 QWEST CORPORATION 656   2003-09-16   
720-523 A Denver CO 9636 QWEST CORPORATION 656      
720-523 2 Denver CO 9636 QWEST CORPORATION 656   2010-07-12   
720-523 4 Denver CO 9636 QWEST CORPORATION 656   2010-07-12   
720-523 6 Denver CO 9636 QWEST CORPORATION 656   2010-07-12   
720-523 7 Denver CO 9636 QWEST CORPORATION 656   2010-07-12   
720-685 A Denver CO 9636 QWEST CORPORATION 656      
720-685 0 Denver CO 9636 QWEST CORPORATION 656      
720-685 1 Denver CO 9636 QWEST CORPORATION 656      
720-685 2 Denver CO 9636 QWEST CORPORATION 656      
720-685 3 Denver CO 9636 QWEST CORPORATION 656      
720-685 4 Denver CO 9636 QWEST CORPORATION 656      
720-685 5 Denver CO 9636 QWEST CORPORATION 656   2006-03-10   
720-685 7 Denver CO 9636 QWEST CORPORATION 656      
720-685 8 Denver CO 9636 QWEST CORPORATION 656      
720-685 9 Denver CO 9636 QWEST CORPORATION 656      

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

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