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: 240 [Rate centres in NPA 240] [Dial plan for NPA 240]

NXX: 428

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-428 A Washington Zone 10 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236      
240-428 0 Washington Zone 10 MD   071F BANDWIDTH.COM CLEC, LLC - MD 236   2012-07-15   
240-428 1 Washington Zone 10 MD   318J COMCAST IP PHONE LLC 236   2011-02-13   
240-428 2 Washington Zone 10 MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2011-04-16   
240-428 3 Washington Zone 10 MD   071F BANDWIDTH.COM CLEC, LLC - MD 236   2012-10-12   
240-428 4 Washington Zone 10 MD   071F BANDWIDTH.COM CLEC, LLC - MD 236   2012-10-12   
240-428 5 Washington Zone 10 MD   5562 METRO PCS, INC. 236   2013-08-20   
240-428 6 Washington Zone 10 MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2011-09-24   
240-428 7 Washington Zone 10 MD   071F BANDWIDTH.COM CLEC, LLC - MD 236   2012-10-20   
240-428 8 Washington Zone 10 MD   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-03-06   
240-428 9 Washington Zone 10 MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2013-06-05   

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.