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: 248

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
557-248 A St Louis MO   128L E. RITTER COMMUNICATIONS, LLC 520   2026-02-19   
557-248 1 St Louis MO   128L E. RITTER COMMUNICATIONS, LLC 520   2026-02-19   

Last updated: Sun, 17 May 2026 03:26:51 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.