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: DNVRCOMA62Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
720-764 8 Hudson CO 907K ALLO COMMUNICATIONS LLC 656   2021-04-15   
970-503 A Greeley CO 907K ALLO COMMUNICATIONS LLC 656      
970-503 5 Greeley CO 907K ALLO COMMUNICATIONS LLC 656   2021-05-02   
970-743 A Fort Morgan CO 907K ALLO COMMUNICATIONS LLC 656      
970-743 3 Fort Morgan CO 907K ALLO COMMUNICATIONS LLC 656   2018-10-14   
970-771 4 Breckenridge CO 907K ALLO COMMUNICATIONS LLC 656   2019-06-24   
970-861 5 Greeley CO 907K ALLO COMMUNICATIONS LLC 656   2024-10-13   
983-955 A Denver CO 907K ALLO COMMUNICATIONS LLC 656   2025-10-24   
983-955 5 Denver CO 907K ALLO COMMUNICATIONS LLC 656   2025-10-24   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.