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: 575 [Rate centres in NPA 575] [Dial plan for NPA 575]

NXX: 228

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
575-228 A Alto NM ALBQNMMAX2Y  123F BANDWIDTH.COM CLEC, LLC - NM 664      
575-228 0 Alto NM   123F BANDWIDTH.COM CLEC, LLC - NM 664   2014-12-07   
575-228 1 Alto NM   206F ONVOY, LLC - NM 664   2017-09-14   
575-228 2 Alto NM   206F ONVOY, LLC - NM 664   2020-01-10   
575-228 3 Alto NM   624H ONVOY SPECTRUM, LLC 664   2021-11-14   
575-228 4 Alto NM   624H ONVOY SPECTRUM, LLC 664   2021-11-14   
575-228 7 Alto NM   206F ONVOY, LLC - NM 664   2019-10-31   
575-228 8 Alto NM   206F ONVOY, LLC - NM 664   2017-12-30   
575-228 9 Alto NM   470G TULAROSA COMMUNICATIONS, INC. - NM 664   2020-07-18   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.