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.

NPA: 303 [Rate centres in NPA 303] [Dial plan for NPA 303]

NXX: 648

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-648 A Denver CO ELBRCOMARS2  9636 QWEST CORPORATION 656      
303-648 0 Denver CO ELBRCOMARS2  9636 QWEST CORPORATION 656      
303-648 1 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2006-09-24   
303-648 2 Denver CO ENWDCO47DS3  8980 XO COLORADO, LLC 656   2005-02-27   
303-648 3 Denver CO ELBRCOMARS2  9636 QWEST CORPORATION 656      
303-648 4 Denver CO ENWDCO47DS3  8980 XO COLORADO, LLC 656   2005-02-27   
303-648 5 Denver CO ENWDCO47DS3  8980 XO COLORADO, LLC 656   2005-02-27   
303-648 6 Denver CO ENWDCO47DS3  8980 XO COLORADO, LLC 656   2005-02-27   
303-648 7 Denver CO ENWDCO47DS3  8980 XO COLORADO, LLC 656   2005-02-27   
303-648 8 Denver CO ELBRCOMARS2  9636 QWEST CORPORATION 656      
303-648 9 Denver CO ELBRCOMARS2  9636 QWEST CORPORATION 656      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.