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: 438

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-438 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-438 0 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-438 1 Baltimore MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-438 2 Baltimore MD BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-438 3 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-438 4 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-438 5 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-438 6 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-438 7 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-438 8 Baltimore MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238      
443-438 9 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.