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: 437

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
531-437 A Omaha NE OMAKNEYWLMD  597J COMPUTER TELEPHONY INNOVATIONS INC. DBA VOXTELESYS 644   2026-05-02   
531-437 0 Omaha NE OMAKNEYWLMD  597J COMPUTER TELEPHONY INNOVATIONS INC. DBA VOXTELESYS 644   2026-05-02   
531-437 1 Omaha NE   5807 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 644   2026-08-16   
531-437 6 Omaha NE   490J BOOST SUBSCRIBERCO L.L.C. 644   2026-10-21   
531-437 8 Omaha NE   5807 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 644   2026-09-11   
531-437 9 Omaha NE   5807 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 644   2026-10-16   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.