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.

Mount Holly, AR

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
870-554 A MTHLARMARS2  9533 SOUTHWESTERN BELL 530      
870-554 0   624H ONVOY SPECTRUM, LLC 530   2024-06-22   
870-554 1   9533 SOUTHWESTERN BELL 530      
870-554 2   9533 SOUTHWESTERN BELL 530      
870-554 4   348F ONVOY, LLC - AR 530   2021-07-21   
870-554 5   516C AT&T CORP. 530   2011-03-25   
870-554 7   508J CENTURYLINK COMMUNICATIONS, LLC 530   2015-04-22   
870-554 8   348F ONVOY, LLC - AR 530   2023-06-02   
870-554 9   802C TELEPORT COMMUNICATIONS AMERICA, LLC - AR 530   2023-03-18   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.