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.

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

<< 1 2 3 4 5 6 7 8 9 10 11 12

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-999 7 Washington Zone 10 MD   321J HD CARRIER LLC 236   2023-12-15   
227-999 8 Washington Zone 10 MD   876D ONVOY, LLC - MD 236   2024-02-19   
227-999 9 Washington Zone 10 MD   530H WIDE VOICE, LLC - MD 236   2023-12-15   

<< 1 2 3 4 5 6 7 8 9 10 11 12

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.