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: 300

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
575-300 A La Mesa NM ALBQNMMAXLX  5470 LEVEL 3 COMMUNICATIONS, LLC - NM 664      
575-300 0 La Mesa NM   5470 LEVEL 3 COMMUNICATIONS, LLC - NM 664   2008-12-04   
575-300 1 La Mesa NM   206F ONVOY, LLC - NM 664   2012-12-15   
575-300 2 La Mesa NM   123F BANDWIDTH.COM CLEC, LLC - NM 664   2018-10-08   
575-300 3 La Mesa NM   206F ONVOY, LLC - NM 664   2016-04-18   
575-300 4 La Mesa NM   206F ONVOY, LLC - NM 664   2016-04-18   
575-300 5 La Mesa NM   377H PEERLESS NETWORK OF NEW MEXICO, LLC - NM 664   2015-07-18   
575-300 6 La Mesa NM   508J CENTURYLINK COMMUNICATIONS, LLC 664   2015-06-24   
575-300 7 La Mesa NM   206F ONVOY, LLC - NM 664   2013-09-15   
575-300 8 La Mesa NM   073H TELNYX LLC 664   2018-09-03   
575-300 9 La Mesa NM   5562 METROPCS, INC. 664   2013-11-11   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.