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: 318 [Rate centres in NPA 318] [Dial plan for NPA 318]

NXX: 328

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
318-328 A Shreveport LA   733J WIRETAP TELECOM, LLC. 486   2026-04-09   
318-328 0 Shreveport LA   733J WIRETAP TELECOM, LLC. 486   2026-04-09   
318-328 1 Shreveport LA   153F BANDWIDTH.COM CLEC, LLC - LA 486   2026-06-06   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.