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: ALTSOKMADS0

Remotes:

Switch Switch name Switch type
BLAROKMARS1  Blair  5ER 
ELDROKMARS1  ELDORADO  5ER 
GRANOKMARS1  Granite  5ER 
HDRCOKMARL0  Hedrick  5ER 
MNGMOKMARS1  MANGUM  5ER 
OLSTOKMARS1  Olustee  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
580-379 A Altus OK 9533 SOUTHWESTERN BELL 536      
580-477 A Altus OK 9533 SOUTHWESTERN BELL 536      
580-480 A Altus OK 9533 SOUTHWESTERN BELL 536      
580-481 A Altus OK 9533 SOUTHWESTERN BELL 536      
580-482 A Altus OK 9533 SOUTHWESTERN BELL 536      

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

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