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.
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OCN: 2217 ATX TELECOMMUNICATIONS SERVICES, LTD. - MD

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
201-257 4 Hasbrouck Heights NJ NBWKNJ481MD  224   2006-01-20   
202-527 6 Washington Zone 1 DC HRNDVACKAMD  236   2007-09-23   
301-392 8 La Plata MD HRNDVACKAMD  236   2004-03-27   
410-774 8 Crofton MD BLTMMDCHAMD  238   2003-02-25   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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