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: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-257 A Washington Zone 14 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-12-05   
227-257 0 Washington Zone 14 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-12-05   
227-257 1 Washington Zone 14 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-12-14   
227-257 2 Washington Zone 14 MD   876D ONVOY, LLC - MD 236   2025-04-06   
227-257 3 Washington Zone 14 MD   876D ONVOY, LLC - MD 236   2025-05-10   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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