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.

OCN: 430H MRSTWN UT COMM DBA MRSTWN UT SYS FIBERNET - TN

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
423-616 A Morristown TN MRTWTNCKDS0  474      
423-616 0 Morristown TN MRTWTNCKDS0  474   2014-10-17   
423-720 9 Newport TN MRTWTNCKDS0  474   2017-12-02   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.