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: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 341

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-341 A Catonsville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-341 0 Catonsville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-341 1 Catonsville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-341 2 Catonsville MD   4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238   2004-02-14   
443-341 3 Catonsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-03-29   
443-341 4 Catonsville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-02-20   
443-341 5 Catonsville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2004-12-27   
443-341 6 Catonsville MD   318J COMCAST IP PHONE LLC 238   2005-03-10   
443-341 7 Catonsville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-03-19   
443-341 8 Catonsville MD   1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   
443-341 9 Catonsville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      

Last updated: Fri, 01 Jul 2022 02:53:40 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.