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: MRTWTNCKDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
423-616 A Morristown TN 430H MRSTWN UT COMM DBA MRSTWN UT SYS FIBERNET - TN 474      
423-616 0 Morristown TN 430H MRSTWN UT COMM DBA MRSTWN UT SYS FIBERNET - TN 474   2014-10-17   

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

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