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: 267

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-267 A Darlington MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-267 0 Darlington MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-267 1 Darlington MD CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-267 2 Darlington MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-267 3 Darlington MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
443-267 4 Darlington MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-267 5 Darlington MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-267 6 Darlington MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-267 7 Darlington MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-267 8 Darlington MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-267 9 Darlington MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.