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: 402

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-402 A Baltimore MD BLTMMDCHX7X  073H TELNYX LLC 238      
667-402 0 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   
667-402 1 Baltimore MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-01-23   
667-402 2 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   
667-402 3 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   
667-402 4 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   
667-402 5 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   
667-402 6 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   
667-402 7 Baltimore MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-09-28   
667-402 8 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   
667-402 9 Baltimore MD BLTMMDCHDMD  551G NUSO, LLC 238   2018-11-07   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.