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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NPA: 227 [Rate centres in NPA 227] [Dial plan for NPA 227]

NXX: 800

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-800 A Frederick MD   624H ONVOY SPECTRUM, LLC 240   2025-01-02   
227-800 0 Frederick MD   624H ONVOY SPECTRUM, LLC 240      
227-800 2 Frederick MD   624H ONVOY SPECTRUM, LLC 240      
227-800 6 Frederick MD   624H ONVOY SPECTRUM, LLC 240      
227-800 8 Frederick MD   624H ONVOY SPECTRUM, LLC 240      
227-800 9 Frederick MD   624H ONVOY SPECTRUM, LLC 240      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

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