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: 417 [Rate centres in NPA 417] [Dial plan for NPA 417]

NXX: 583

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
417-583 A Clever MO CLVRMOLURS0  9533 SOUTHWESTERN BELL 522      
417-583 2 Clever MO CLVRMOLURS0  9533 SOUTHWESTERN BELL 522      
417-583 3 Clever MO SPFDMOTLX5X  516C AT&T CORP. 522   2013-11-08   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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