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: 667 [Rate centres in NPA 667] [Dial plan for NPA 667]

NXX: 400

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-400 A Baltimore MD BLTQMD012MD  964H BARR TELL USA, INC. 238      
667-400 0 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-10-15   
667-400 1 Baltimore MD BLTQMD012MD  964H BARR TELL USA, INC. 238   2017-01-08   
667-400 2 Baltimore MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2017-03-02   
667-400 3 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-09-17   
667-400 4 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-09-17   
667-400 5 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-09-17   
667-400 6 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-09-17   
667-400 7 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-09-17   
667-400 8 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   
667-400 9 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.