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: 815 [Rate centres in NPA 815] [Dial plan for NPA 815]

NXX: 231

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
815-231 A Rockford IL RCFRILREDS0  9329 ILLINOIS BELL TEL CO 360      
815-231 0 Rockford IL RCFRILREDS0  9329 ILLINOIS BELL TEL CO 360      
815-231 1 Rockford IL RCFRILREDS0  9329 ILLINOIS BELL TEL CO 360      
815-231 2 Rockford IL RCFRILREDS0  9329 ILLINOIS BELL TEL CO 360      
815-231 3 Rockford IL RCFRILREDS0  9329 ILLINOIS BELL TEL CO 360      
815-231 4 Rockford IL RCFRILRTXEY  145J TERRA NOVA TELECOM INC. 360      
815-231 5 Rockford IL RCFRILREDS0  9329 ILLINOIS BELL TEL CO 360      
815-231 6 Rockford IL RCFRILRCMMD  6529 T-MOBILE USA, INC. 360      
815-231 7 Rockford IL RCFRILREDS0  9329 ILLINOIS BELL TEL CO 360      
815-231 8 Rockford IL   829J PAETEC ITEL, LLC 360      
815-231 9 Rockford IL RCFRILREDS0  9329 ILLINOIS BELL TEL CO 360      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.