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: 231 [Rate centres in NPA 231] [Dial plan for NPA 231]

NXX: 291

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
231-291 A Muskegon MI GDRPMIBQDS1  4632 TELNET WORLDWIDE, INC. 348      
231-291 0 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   
231-291 1 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   
231-291 2 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   
231-291 3 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   
231-291 4 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   
231-291 5 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   
231-291 6 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   
231-291 7 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   
231-291 8 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   
231-291 9 Muskegon MI   4632 TELNET WORLDWIDE, INC. 348   2012-07-12   

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.