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: 662 [Rate centres in NPA 662] [Dial plan for NPA 662]

NXX: 421

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
662-421 A Tremont MS JCSNMSHA2MD  5178 LEVEL 3 COMMUNICATIONS, LLC - MS 482      
662-421 0 Tremont MS JCSNMSCP59Z  073H TELNYX LLC 482   2023-10-20   
662-421 4 Tremont MS JCSNMSHA2MD  5178 LEVEL 3 COMMUNICATIONS, LLC - MS 482   2021-02-04   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.