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.
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Switch: BILXMSEDXPX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
228-438 A Biloxi MS 220C LEVEL 3 TELECOM OF MISSISSIPPI, LLC - MS 484      
228-438 2 Biloxi MS 220C LEVEL 3 TELECOM OF MISSISSIPPI, LLC - MS 484   2012-04-26   
228-574 4 Gulfport MS 220C LEVEL 3 TELECOM OF MISSISSIPPI, LLC - MS 484   2013-07-29   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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