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: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-257 A Nanjemoy MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
240-257 0 Nanjemoy MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-03-05   
240-257 1 Nanjemoy MD TYCRVA03AMD  2589 US LEC OF MARYLAND, INC. 236   2004-02-04   
240-257 2 Nanjemoy MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-13   
240-257 3 Nanjemoy MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-13   
240-257 4 Nanjemoy MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2011-12-02   
240-257 5 Nanjemoy MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2015-05-21   
240-257 6 Nanjemoy MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-11-18   
240-257 7 Nanjemoy MD WASHDCCZDS1  4773 XO MARYLAND, LLC 236   2010-11-19   
240-257 8 Nanjemoy MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-08-15   
240-257 9 Nanjemoy MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      

Last updated: Tue, 15 Nov 2022 00:10:00 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.