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.

Switch: LAMSNMMARS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
575-233 A La Mesa NM 9636 QWEST CORPORATION 664      
575-233 0 La Mesa NM 9636 QWEST CORPORATION 664      
575-233 1 La Mesa NM 9636 QWEST CORPORATION 664      
575-233 2 La Mesa NM 9636 QWEST CORPORATION 664      
575-233 3 La Mesa NM 9636 QWEST CORPORATION 664      
575-233 4 La Mesa NM 9636 QWEST CORPORATION 664      
575-233 5 La Mesa NM 9636 QWEST CORPORATION 664      
575-233 9 La Mesa NM 9636 QWEST CORPORATION 664      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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