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.

Switch: SLGRTNXARS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
423-349 A Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-349 0 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-349 1 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-349 2 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-349 4 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-349 5 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-349 6 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-349 7 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-349 9 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-516 A Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956      
423-516 2 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956   2012-04-13   
423-516 3 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956   2012-05-26   
423-516 4 Sullivan Gardens TN 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN 956   2012-05-26   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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