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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: COVLILCQXNX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
618-636 A Alton IL 478J NUSO, LLC 520      
618-636 1 Alton IL 478J NUSO, LLC 520   2020-10-27   
618-908 5 Alton IL 478J NUSO, LLC 520   2023-12-03   

Last updated: Sat, 15 Nov 2025 03:38:44 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.