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: 238

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-238 A Preston MD ESTNMDBNGT0  2593 CORE COMMUNICATIONS, INC.- MD 242      
667-238 0 Preston MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-08-03   
667-238 1 Preston MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-08-03   
667-238 2 Preston MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-08-03   
667-238 3 Preston MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2021-03-05   
667-238 4 Preston MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242   2019-05-02   
667-238 5 Preston MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2023-02-12   
667-238 6 Preston MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242   2019-05-02   
667-238 7 Preston MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242   2019-05-02   
667-238 8 Preston MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2019-03-04   
667-238 9 Preston MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2019-03-04   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.