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: 331 [Rate centres in NPA 331] [Dial plan for NPA 331]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-237 A Naperville IL   7196 MCI WORLDCOM COMMUNICATIONS, INC. - IL 358   2017-12-22   
331-237 0 Naperville IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2018-04-21   
331-237 1 Naperville IL   7196 MCI WORLDCOM COMMUNICATIONS, INC. - IL 358   2017-12-22   
331-237 2 Naperville IL   7196 MCI WORLDCOM COMMUNICATIONS, INC. - IL 358   2017-12-22   
331-237 3 Naperville IL   7196 MCI WORLDCOM COMMUNICATIONS, INC. - IL 358   2017-12-22   
331-237 4 Naperville IL   7196 MCI WORLDCOM COMMUNICATIONS, INC. - IL 358   2017-12-22   
331-237 5 Naperville IL   7196 MCI WORLDCOM COMMUNICATIONS, INC. - IL 358   2019-11-08   
331-237 6 Naperville IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2018-01-19   
331-237 7 Naperville IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2018-01-19   
331-237 8 Naperville IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2018-03-24   
331-237 9 Naperville IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2018-03-24   

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.