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: 265

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-265 A Denver CO DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-265 0 Denver CO DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-265 1 Denver CO DNVRCOII3MD  6529 T-MOBILE USA, INC. 656   2005-10-01   
303-265 2 Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-265 3 Denver CO LTTNCOHLDS0  9636 QWEST CORPORATION 656      
303-265 4 Denver CO BRFDCOMADS0  9636 QWEST CORPORATION 656      
303-265 5 Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-265 6 Denver CO   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-265 7 Denver CO DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-265 8 Denver CO DNVRCODCDS0  9636 QWEST CORPORATION 656      
303-265 9 Denver CO DNVRCODCDS0  9636 QWEST CORPORATION 656      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.