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: 423 [Rate centres in NPA 423] [Dial plan for NPA 423]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-437 A La Follette TN KNVLTNMAX1Z  4806 LEVEL 3 COMMUNICATIONS, LLC - TN 474      
423-437 0 La Follette TN   4806 LEVEL 3 COMMUNICATIONS, LLC - TN 474      
423-437 1 La Follette TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2007-08-06   
423-437 2 La Follette TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2008-10-04   
423-437 3 La Follette TN   284E YMAX COMMUNICATIONS CORP. - TN 474   2008-06-21   
423-437 4 La Follette TN   284E YMAX COMMUNICATIONS CORP. - TN 474   2008-06-21   
423-437 5 La Follette TN   284E YMAX COMMUNICATIONS CORP. - TN 474   2008-06-21   
423-437 6 La Follette TN   284E YMAX COMMUNICATIONS CORP. - TN 474   2008-06-21   
423-437 7 La Follette TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2009-02-05   
423-437 8 La Follette TN   408D COMCAST PHONE OF TENNESSEE, LLC - TN 474   2011-08-18   
423-437 9 La Follette TN   4806 LEVEL 3 COMMUNICATIONS, LLC - TN 474   2013-08-29   

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.