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: 712 [Rate centres in NPA 712] [Dial plan for NPA 712]

NXX: 623

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
712-623 A Red Oak IA RDOKIACORS6  9631 QWEST CORPORATION 644      
712-623 0 Red Oak IA   444G AUREON COMMUNICATIONS, LLC 644   2014-08-22   
712-623 1 Red Oak IA   593K MCC TELEPHONY LLC 644   2005-07-14   
712-623 2 Red Oak IA   9631 QWEST CORPORATION 644      
712-623 3 Red Oak IA   9631 QWEST CORPORATION 644      
712-623 4 Red Oak IA   9631 QWEST CORPORATION 644      
712-623 5 Red Oak IA   9631 QWEST CORPORATION 644      
712-623 6 Red Oak IA   9631 QWEST CORPORATION 644      
712-623 7 Red Oak IA   9631 QWEST CORPORATION 644      
712-623 8 Red Oak IA   9631 QWEST CORPORATION 644      
712-623 9 Red Oak IA   9631 QWEST CORPORATION 644      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.