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: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-234 A Washington Zone 16 MD ALTWMDATDS0  9212 VERIZON MARYLAND, INC. 236      
301-234 0 Washington Zone 16 MD   9212 VERIZON MARYLAND, INC. 236      
301-234 2 Washington Zone 16 MD   7421 AT&T LOCAL 236   2003-02-16   
301-234 3 Washington Zone 16 MD   5978 BROADVIEW NETWORKS, INC. - VA 236   2017-10-06   
301-234 4 Washington Zone 16 MD   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-23   
301-234 6 Washington Zone 16 MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2008-05-16   
301-234 7 Washington Zone 16 MD   876D ONVOY, LLC - MD 236   2018-09-13   
301-234 8 Washington Zone 16 MD   876D ONVOY, LLC - MD 236   2018-09-13   

Last updated: Thu, 31 Jan 2019 11:20:40 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.