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: 531 [Rate centres in NPA 531] [Dial plan for NPA 531]

NXX: 305

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
531-305 A Hickman NE LNCLNEXLX5X  3233 LEVEL 3 COMMUNICATIONS, LLC - NE 958      
531-305 0 Hickman NE   624H ONVOY SPECTRUM, LLC 958   2024-03-09   
531-305 1 Hickman NE   3233 LEVEL 3 COMMUNICATIONS, LLC - NE 958   2023-01-19   
531-305 3 Hickman NE   549E ONVOY, LLC - NE 958   2024-03-15   
531-305 5 Hickman NE   710A ALLO COMMUNICATIONS, LLC - NE 958   2023-03-31   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.