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: 212

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
557-212 A Mehlville MO STLVMOOH6MD  5562 METROPCS, INC. 520      
557-212 4 Mehlville MO STLSMOWQCMD  515J IP HORIZON LLC 520   2023-12-07   
557-212 5 Mehlville MO STLSMOWQCMD  515J IP HORIZON LLC 520   2023-12-07   
557-212 6 Mehlville MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2024-04-04   
557-212 7 Mehlville MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2024-02-26   
557-212 8 Mehlville MO NWTPMOABGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2024-02-22   
557-212 9 Mehlville MO STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2024-12-05   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.