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: 500

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
557-500 A St Louis MO STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520      
557-500 0 St Louis MO STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2022-10-15   
557-500 1 St Louis MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2022-10-16   
557-500 2 St Louis MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2022-10-16   
557-500 3 St Louis MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2022-10-16   
557-500 4 St Louis MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2022-11-04   
557-500 5 St Louis MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2022-11-04   
557-500 6 St Louis MO STLSMO05RMD  993E BANDWIDTH.COM CLEC, LLC - MO 520   2022-10-29   
557-500 7 St Louis MO STLSMO05RMD  993E BANDWIDTH.COM CLEC, LLC - MO 520   2022-10-29   
557-500 8 St Louis MO STLSMO05RMD  993E BANDWIDTH.COM CLEC, LLC - MO 520   2022-10-29   
557-500 9 St Louis MO STLSMO05RMD  993E BANDWIDTH.COM CLEC, LLC - MO 520   2022-10-29   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.