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-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
575-228 9 Alto NM RUDSNM240MD  664   2020-07-18   
575-454 A Ruidoso NM RUDSNM240MD  664      
575-454 5 Ruidoso NM RUDSNM240MD  664   2017-07-28   
575-488 A Alamogordo NM ALMGNMMA0MD  664      
575-651 9 Ruidoso Downs NM RUDSNM240MD  664   2017-08-31   

Last updated: Tue, 04 May 2021 15:04:27 UTC

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