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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NPA: 228 [Rate centres in NPA 228] [Dial plan for NPA 228]

NXX: 275

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
228-275 A Biloxi MS BILXMSEDX4X  5178 LEVEL 3 COMMUNICATIONS, LLC - MS 484      
228-275 1 Biloxi MS BILXMSAT6MD  145J TERRA NOVA TELECOM INC. 484   2026-04-30   
228-275 3 Biloxi MS BILXMSEDX4X  5178 LEVEL 3 COMMUNICATIONS, LLC - MS 484      
228-275 5 Biloxi MS BILXMSEDX4X  5178 LEVEL 3 COMMUNICATIONS, LLC - MS 484      

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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