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.

Switch: DNVTCO56DS8

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 >>

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-557 7 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-557 9 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-558 A Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-558 2 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-558 3 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-558 4 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-558 5 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-558 6 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-558 7 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-558 9 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-562 A Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-562 0 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-562 1 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-562 2 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-562 3 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-562 9 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 A Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 0 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 1 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 2 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 3 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 4 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 5 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 6 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 7 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-563 8 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-569 4 Georgetown CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2011-03-29   
303-569 6 Georgetown CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2004-11-11   
303-569 8 Georgetown CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-05-20   
303-578 A Keenesburg CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-578 1 Keenesburg CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2008-05-30   
303-578 3 Keenesburg CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2007-05-21   
303-586 A Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-586 0 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2020-12-03   
303-586 1 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2008-02-01   
303-586 2 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2008-02-12   
303-586 3 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2008-02-12   
303-586 4 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2008-02-12   
303-590 A Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-590 1 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-590 2 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-590 6 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-590 7 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-590 9 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-625 A Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-625 0 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-625 1 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-625 2 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-625 4 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
303-625 5 Denver CO 6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 >>

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.