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]

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
623-738 A Phoenix AZ PHNDAZ91DS5  3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666      
623-738 0 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666   2009-07-03   
623-738 1 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666   2009-07-03   
623-738 2 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666   2009-07-03   
623-738 3 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666   2009-07-03   
623-738 4 Phoenix AZ   587F BANDWIDTH.COM CLEC, LLC - AZ 666   2010-05-09   
623-738 5 Phoenix AZ   587F BANDWIDTH.COM CLEC, LLC - AZ 666   2010-05-09   
623-738 6 Phoenix AZ   587F BANDWIDTH.COM CLEC, LLC - AZ 666   2010-05-09   
623-738 7 Phoenix AZ   6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 666   2009-09-10   
623-738 8 Phoenix AZ   6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 666   2009-09-20   
623-738 9 Phoenix AZ   6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 666   2009-09-20   
623-742 A Phoenix AZ NWRVAZMADS0  9636 QWEST CORPORATION 666      
623-742 0 Phoenix AZ   9636 QWEST CORPORATION 666      
623-742 1 Phoenix AZ   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 666   2004-09-16   
623-742 2 Phoenix AZ   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 666   2004-09-16   
623-742 3 Phoenix AZ   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 666   2004-09-16   
623-742 4 Phoenix AZ   9636 QWEST CORPORATION 666      
623-742 5 Phoenix AZ   6529 T-MOBILE USA, INC. 666   2005-04-01   
623-742 6 Phoenix AZ   9636 QWEST CORPORATION 666      
623-742 7 Phoenix AZ   9636 QWEST CORPORATION 666      
623-742 8 Phoenix AZ   6529 T-MOBILE USA, INC. 666   2005-04-01   
623-742 9 Phoenix AZ   9636 QWEST CORPORATION 666      
623-745 A Phoenix AZ PHNZAZZJDS1  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 666      
623-745 0 Phoenix AZ   630E ONVOY, LLC - AZ 666   2015-12-22   
623-745 1 Phoenix AZ   630E ONVOY, LLC - AZ 666   2015-12-22   
623-745 2 Phoenix AZ   630E ONVOY, LLC - AZ 666   2016-02-19   
623-745 3 Phoenix AZ   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 666   2015-11-12   
623-745 4 Phoenix AZ   587F BANDWIDTH.COM CLEC, LLC - AZ 666   2019-03-06   
623-745 5 Phoenix AZ   6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 666   2016-01-07   
623-745 6 Phoenix AZ   6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 666   2016-02-09   
623-745 7 Phoenix AZ   630E ONVOY, LLC - AZ 666   2015-11-13   
623-745 8 Phoenix AZ   630E ONVOY, LLC - AZ 666   2016-02-19   
623-745 9 Phoenix AZ   630E ONVOY, LLC - AZ 666   2016-02-19   
623-748 A Phoenix AZ PHNDAZ91DS5  3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666      
623-748 0 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666   2005-01-20   
623-748 1 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666   2005-02-05   
623-748 2 Phoenix AZ   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 666   2006-08-31   
623-748 3 Phoenix AZ   318J COMCAST IP PHONE, LLC 666   2005-05-31   
623-748 4 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666      
623-748 5 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666   2005-01-21   
623-748 6 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666   2005-01-21   
623-748 7 Phoenix AZ   3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 666   2005-01-21   
623-748 8 Phoenix AZ   318J COMCAST IP PHONE, LLC 666   2005-05-31   
623-748 9 Phoenix AZ   318J COMCAST IP PHONE, LLC 666   2005-05-31   
623-755 A Phoenix AZ PHNXAZMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 666      
623-755 0 Phoenix AZ   6010 NEW CINGULAR WIRELESS PCS, LLC 666   2008-10-24   
623-755 1 Phoenix AZ   6010 NEW CINGULAR WIRELESS PCS, LLC 666   2008-10-24   
623-755 2 Phoenix AZ   6010 NEW CINGULAR WIRELESS PCS, LLC 666   2008-10-24   
623-755 3 Phoenix AZ   6529 T-MOBILE USA, INC. 666   2009-01-17   
623-755 4 Phoenix AZ   6529 T-MOBILE USA, INC. 666   2009-01-17   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.