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]

NXX: 258

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-258 A Gaithersburg MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2024-12-22   
227-258 0 Gaithersburg MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
227-258 8 Gaithersburg MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
227-258 9 Gaithersburg MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.