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: 274

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-274 A Severn MD ODTNMDPORS2  9212 VERIZON MARYLAND, INC. 238      
443-274 0 Severn MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-274 1 Severn MD BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-274 2 Severn MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-274 3 Severn MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
443-274 4 Severn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-274 5 Severn MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-274 6 Severn MD PIVLMDPKFMD  5966 LIGHTWAVE COMMUNICATIONS, LLC - MD 238      
443-274 7 Severn MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-274 8 Severn MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-274 9 Severn MD ODTNMDPORS2  9212 VERIZON MARYLAND, INC. 238      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.