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: 405

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-405 A Randallstown MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-405 0 Randallstown MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-405 1 Randallstown MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-405 2 Randallstown MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-03   
443-405 3 Randallstown MD BLTMMDCHXFX  318J COMCAST IP PHONE LLC 238   2006-09-27   
443-405 4 Randallstown MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-405 5 Randallstown MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC DBA T-MOBILE USA 238   2021-04-30   
443-405 6 Randallstown MD BLTMMDCHXFX  318J COMCAST IP PHONE LLC 238   2018-11-29   
443-405 7 Randallstown MD BLTMMDCHXFX  318J COMCAST IP PHONE LLC 238   2011-12-10   
443-405 8 Randallstown MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-405 9 Randallstown MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   

Last updated: Fri, 13 May 2022 22:16:13 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.