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.

OCN: 861F MCC TELEPHONY OF THE MID-ATLANTIC, LLC - MD

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
410-600 0 Berlin MD   242   2006-08-11   
410-600 2 Berlin MD   242   2019-07-13   
410-600 4 Berlin MD   242   2017-07-02   
410-835 5 Willards MD   242   2010-08-21   
410-973 A Berlin MD SLBRMDSBXWX  242      
410-973 1 Berlin MD   242   2010-08-21   
443-727 3 Bishopville MD   242   2010-08-21   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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