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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OCN: 4510 UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
423-952 4 Johnson City TN JHCYTNXCPS0  956      
423-952 5 Johnson City TN JHCYTNXCPS0  956      
423-952 6 Johnson City TN JHCYTNXCPS0  956      
423-952 7 Johnson City TN JHCYTNXCPS0  956      
423-952 8 Johnson City TN JHCYTNXCPS0  956      
423-953 A Johnson City TN JHCYTNXCPS0  956      
423-968 A Bristol TN BRSTTNXADS0  956      
423-975 A Johnson City TN JHCYTNXCPS0  956      
423-979 A Johnson City TN JHCYTNXCPS0  956      
423-979 0 Johnson City TN JHCYTNXCPS0  956      
423-979 1 Johnson City TN JHCYTNXCPS0  956      
423-979 2 Johnson City TN JHCYTNXCPS0  956      
423-979 3 Johnson City TN JHCYTNXCPS0  956      
423-979 4 Johnson City TN JHCYTNXCPS0  956      
423-979 5 Johnson City TN JHCYTNXCPS0  956      
423-979 6 Johnson City TN JHCYTNXCPS0  956      
423-979 7 Johnson City TN JHCYTNXCPS0  956      
423-989 A Bristol TN BRSTTNXADS0  956      
423-990 A Bristol TN BRSTTNXADS0  956      

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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