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: 623 [Rate centres in NPA 623] [Dial plan for NPA 623]

NXX: 999

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
623-999 A Phoenix AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666      
623-999 0 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2014-02-22   
623-999 1 Phoenix AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666   2013-11-21   
623-999 2 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2014-02-22   
623-999 3 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2014-02-22   
623-999 4 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2014-02-22   
623-999 5 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2014-02-22   
623-999 6 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2013-12-20   
623-999 7 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2013-12-20   
623-999 8 Phoenix AZ TEMPAZNR5MD  6529 T-MOBILE USA, INC. 666   2013-12-20   
623-999 9 Phoenix AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666   2013-11-21   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.