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: 777

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-777 A Downers Grove IL RVDLILBDAMD  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
331-777 0 Downers Grove IL RVDLILBDAMD  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2012-09-05   
331-777 1 Downers Grove IL   515J IP HORIZON LLC 358   2013-05-15   
331-777 2 Downers Grove IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2013-07-19   
331-777 3 Downers Grove IL EGVGILIFDS1  7196 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 358   2012-06-29   
331-777 4 Downers Grove IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2013-12-21   
331-777 5 Downers Grove IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2012-10-26   
331-777 6 Downers Grove IL EGVGILIFDS1  7196 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 358   2012-11-27   
331-777 7 Downers Grove IL CHCGILCPDS9  138G LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 358   2014-04-10   
331-777 8 Downers Grove IL EGVGILIFDS1  7196 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 358   2013-05-15   
331-777 9 Downers Grove IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2014-06-20   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.