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: 520 [Rate centres in NPA 520] [Dial plan for NPA 520]

NXX: 583

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-583 A Whitlow AZ PHNXAZ28X3X  515J IP HORIZON LLC 666      
520-583 0 Whitlow AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666   2021-11-27   
520-583 1 Whitlow AZ   515J IP HORIZON LLC 666   2021-10-25   
520-583 2 Whitlow AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666   2021-11-27   
520-583 3 Whitlow AZ PHNXAZMAXQY  624H ONVOY SPECTRUM, LLC 666   2021-11-07   
520-583 4 Whitlow AZ PHNXAZMAXQY  624H ONVOY SPECTRUM, LLC 666   2021-11-07   
520-583 5 Whitlow AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666   2021-10-26   
520-583 6 Whitlow AZ PHNXAZ19DS3  579F PEERLESS NETWORK OF ARIZONA, LLC - AZ 666   2021-12-19   
520-583 7 Whitlow AZ PHNXAZ197MD  939H COMMIO, LLC 666   2021-11-18   
520-583 8 Whitlow AZ PHNXAZ197MD  939H COMMIO, LLC 666   2021-11-18   
520-583 9 Whitlow AZ PHNXAZ19BMD  145J TERRA NOVA TELECOM INC. 666   2024-02-13   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.