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: 504 [Rate centres in NPA 504] [Dial plan for NPA 504]

NXX: 537

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
504-537 A New Orleans LA   749E ONVOY, LLC - LA 490   2025-05-05   
504-537 0 New Orleans LA   749E ONVOY, LLC - LA 490   2025-05-05   
504-537 1 New Orleans LA   749E ONVOY, LLC - LA 490   2025-05-05   
504-537 2 New Orleans LA   749E ONVOY, LLC - LA 490   2025-05-05   
504-537 3 New Orleans LA   749E ONVOY, LLC - LA 490   2025-05-05   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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