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: STLSMOWQGMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
314-557 A Ladue MO 732J NUSO, LLC 520      
314-557 1 Ladue MO 732J NUSO, LLC 520   2023-04-03   
314-564 0 Ladue MO 732J NUSO, LLC 520   2024-06-23   
314-637 3 Ladue MO 732J NUSO, LLC 520   2024-06-23   
557-210 8 Ladue MO 732J NUSO, LLC 520   2023-12-22   
557-210 9 Ladue MO 732J NUSO, LLC 520   2023-12-22   

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

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