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: HLRNCOFP1MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
720-697 A Denver CO 7575 CENTURYLINK COMMUNICATIONS LLC 656      
720-722 A Denver CO 7575 CENTURYLINK COMMUNICATIONS LLC 656      
720-758 A Denver CO 7575 CENTURYLINK COMMUNICATIONS LLC 656      
720-795 A Denver CO 7575 CENTURYLINK COMMUNICATIONS LLC 656      
970-598 A Platteville CO 7575 CENTURYLINK COMMUNICATIONS LLC 656      
970-866 A La Salle CO 7575 CENTURYLINK COMMUNICATIONS LLC 656      
970-919 A Silverton CO 7575 CENTURYLINK COMMUNICATIONS LLC 656      

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.