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: CDRRIAAB4MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
319-242 A Cedar Falls IA 7421 AT&T - LOCAL 635      
319-406 A Denver IA 7421 AT&T - LOCAL 635      
319-406 1 Denver IA 7421 AT&T - LOCAL 635      
319-464 A Waterloo IA 7421 AT&T - LOCAL 635      
319-464 3 Waterloo IA 7421 AT&T - LOCAL 635      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.