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

NXX: 478

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
623-478 A Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      
623-478 0 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      
623-478 1 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      
623-478 2 Phoenix AZ PHNXAZMAX1Z  318J COMCAST IP PHONE, LLC 666   2005-02-06   
623-478 3 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      
623-478 4 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      
623-478 5 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      
623-478 6 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      
623-478 7 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      
623-478 8 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      
623-478 9 Phoenix AZ TLSNAZMADS0  9636 QWEST CORPORATION 666      

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

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