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.

NPA: 573 [Rate centres in NPA 573] [Dial plan for NPA 573]

NXX: 831

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
573-831 A Caledonia MO STLSMOWQDS2  093F ONVOY, LLC - MO 520      
573-831 0 Caledonia MO STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2024-03-23   
573-831 3 Caledonia MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2021-05-13   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.