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: 601 [Rate centres in NPA 601] [Dial plan for NPA 601]

NXX: 343

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
601-343 A Heidelberg MS HDLBMSMAXMD  4664 CENTURYLINK COMMUNICATIONS LLC - MS 482      
601-343 0 Heidelberg MS JCSNMSCPXMZ  719E ONVOY, LLC - MS 482   2021-02-23   
601-343 3 Heidelberg MS   145J TERRA NOVA TELECOM INC. 482   2025-07-16   
601-343 9 Heidelberg MS HDLBMSMAXMD  4664 CENTURYLINK COMMUNICATIONS LLC - MS 482      

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.