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: NYCMNY37UMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
516-600 A Nassau Zone 6 NY 321J HD CARRIER LLC 132      
516-916 A Nassau Zone 1 NY 321J HD CARRIER LLC 132      
631-568 A Amityville NY 321J HD CARRIER LLC 132      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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