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: 244

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-244 A Ridge MD WASHDCSWNMD  321J HD CARRIER LLC 236      
227-244 4 Ridge MD   824J OPENTACT INC. 236   2026-09-13   
227-244 6 Ridge MD WASHDCSWNMD  321J HD CARRIER LLC 236   2024-07-27   
227-244 7 Ridge MD   962J VERSATEL LLC 236   2026-10-24   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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