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: 928 [Rate centres in NPA 928] [Dial plan for NPA 928]

NXX: 544

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
928-544 A Castle Rock AZ PHNXAZ19AMD  965H FRACTEL, LLC 666      
928-544 0 Castle Rock AZ PHNXAZ19DS3  579F PEERLESS NETWORK OF ARIZONA, LLC - AZ 666      
928-544 1 Castle Rock AZ PHNXAZ28VMD  073H TELNYX LLC 666      
928-544 3 Castle Rock AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666      
928-544 4 Castle Rock AZ PHNXAZ19AMD  965H FRACTEL, LLC 666      
928-544 5 Castle Rock AZ PHNXAZMAXQY  624H ONVOY SPECTRUM, LLC 666      
928-544 6 Castle Rock AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666      
928-544 7 Castle Rock AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666      
928-544 8 Castle Rock AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666      
928-544 9 Castle Rock AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.