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.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-549 7 Frederick MD 551G NUSO, LLC 240   2018-02-28   
240-608 A Frederick MD 551G NUSO, LLC 240      
240-608 1 Frederick MD 551G NUSO, LLC 240   2013-05-08   
240-815 8 Frederick MD 551G NUSO, LLC 240   2016-04-01   
240-831 3 Frederick MD 551G NUSO, LLC 240   2018-11-07   
240-831 9 Frederick MD 551G NUSO, LLC 240   2018-07-23   
240-840 2 Frederick MD 551G NUSO, LLC 240   2018-11-07   
240-840 3 Frederick MD 551G NUSO, LLC 240   2018-11-07   
240-840 4 Frederick MD 551G NUSO, LLC 240   2018-11-07   
240-840 5 Frederick MD 551G NUSO, LLC 240   2018-11-07   
240-840 9 Frederick MD 551G NUSO, LLC 240   2018-10-14   
240-971 1 Frederick MD 551G NUSO, LLC 240   2018-10-14   
240-971 2 Frederick MD 551G NUSO, LLC 240   2018-11-07   
240-971 3 Frederick MD 551G NUSO, LLC 240   2018-11-07   
240-971 4 Frederick MD 551G NUSO, LLC 240   2018-11-07   
240-971 5 Frederick MD 551G NUSO, LLC 240   2018-11-07   
301-644 0 Frederick MD 551G NUSO, LLC 240   2018-11-07   

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

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