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: 557 [Rate centres in NPA 557] [Dial plan for NPA 557]

NXX: 567

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
557-567 A Kirkwood MO STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2025-01-02   
557-567 0 Kirkwood MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2025-01-03   
557-567 1 Kirkwood MO   093F ONVOY, LLC - MO 520   2025-02-01   
557-567 5 Kirkwood MO STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2025-01-02   
557-567 6 Kirkwood MO STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2025-01-02   
557-567 7 Kirkwood MO STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2025-01-02   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.