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: LTRKARFRXKZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
501-643 A Little Rock AR 506J TWILIO INTERNATIONAL, INC. 528      
501-643 6 Little Rock AR 506J TWILIO INTERNATIONAL, INC. 528   2021-07-21   
870-667 9 Ashdown AR 506J TWILIO INTERNATIONAL, INC. 528   2021-09-07   

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

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