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: CRDLILXEXWX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
618-850 A Herrin IL 506J TWILIO INTERNATIONAL, INC. 362      
618-850 8 Herrin IL 506J TWILIO INTERNATIONAL, INC. 362   2022-10-05   

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

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