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: 720 [Rate centres in NPA 720] [Dial plan for NPA 720]

NXX: 544

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-544 A Denver CO LKWDCOMADS0  9636 QWEST CORPORATION 656      
720-544 0 Denver CO LKWDCOMADS0  9636 QWEST CORPORATION 656      
720-544 1 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-05-18   
720-544 2 Denver CO LKWDCOMADS0  9636 QWEST CORPORATION 656      
720-544 3 Denver CO AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2009-08-24   
720-544 4 Denver CO LKWDCOMADS0  9636 QWEST CORPORATION 656      
720-544 5 Denver CO LKWDCOMADS0  9636 QWEST CORPORATION 656      
720-544 6 Denver CO DNVTCOUZAMD  4788 MCLEODUSA TELECOMMUNICATION SERVICES, INC. - CO 656   2007-11-16   
720-544 7 Denver CO ENWDCO47DS4  320E YMAX COMMUNICATIONS CORP. - CO 656   2008-04-11   
720-544 8 Denver CO LKWDCOMADS0  9636 QWEST CORPORATION 656      
720-544 9 Denver CO DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-10-10   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.