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: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-257 A Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 0 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 1 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 2 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 3 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 4 Columbia MD BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 5 Columbia MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-257 6 Columbia MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
667-257 7 Columbia MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-257 8 Columbia MD   2593 CORE COMMUNICATIONS, INC.- MD 238      
667-257 9 Columbia MD   2593 CORE COMMUNICATIONS, INC.- MD 238      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.