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: PHNXAZMAXGZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
623-307 A Phoenix AZ 907K ALLO COMMUNICATIONS LLC 666      
623-307 1 Phoenix AZ 907K ALLO COMMUNICATIONS LLC 666   2023-06-18   
623-955 A Phoenix AZ 907K ALLO COMMUNICATIONS LLC 666   2025-12-19   
623-955 5 Phoenix AZ 907K ALLO COMMUNICATIONS LLC 666   2025-12-19   
928-418 0 Kingman AZ 907K ALLO COMMUNICATIONS LLC 666   2023-09-25   
928-456 5 Flagstaff AZ 907K ALLO COMMUNICATIONS LLC 666   2023-11-24   
928-483 5 Yuma AZ 907K ALLO COMMUNICATIONS LLC 666   2023-08-31   
928-508 5 Yuma AZ 907K ALLO COMMUNICATIONS LLC 666   2025-05-26   
928-512 A Somerton AZ 907K ALLO COMMUNICATIONS LLC 666      
928-512 5 Somerton AZ 907K ALLO COMMUNICATIONS LLC 666   2023-11-24   
928-540 5 Lake Havasu City AZ 907K ALLO COMMUNICATIONS LLC 666   2025-05-26   
928-732 0 Lake Havasu City AZ 907K ALLO COMMUNICATIONS LLC 666   2023-08-28   
928-880 5 Kingman AZ 907K ALLO COMMUNICATIONS LLC 666   2025-06-30   

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

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