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: 417 [Rate centres in NPA 417] [Dial plan for NPA 417]

NXX: 542

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
417-542 A Forsyth MO   5814 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 522   2025-12-20  2026-08-24 

Last updated: Fri, 10 Jul 2026 02:55:48 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.