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: MSSNTXMIDS0

Remotes:

Switch Switch name Switch type
MCALTXHIRS1  Hidalgo  RSC 
ZPTATXZARS0  Zapata  RLC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-205 A Mission TX 9533 SOUTHWESTERN BELL 568      
956-323 A Mission TX 9533 SOUTHWESTERN BELL 568      
956-424 A Mission TX 9533 SOUTHWESTERN BELL 568      
956-519 A Mission TX 9533 SOUTHWESTERN BELL 568      
956-580 A Mission TX 9533 SOUTHWESTERN BELL 568      
956-581 A Mission TX 9533 SOUTHWESTERN BELL 568      
956-583 A Mission TX 9533 SOUTHWESTERN BELL 568      
956-584 A Mission TX 9533 SOUTHWESTERN BELL 568      
956-585 A Mission TX 9533 SOUTHWESTERN BELL 568      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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