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: 820

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-820 A Elkridge MD BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-820 0 Elkridge MD BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-820 1 Elkridge MD BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-820 2 Elkridge MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
443-820 3 Elkridge MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-820 4 Elkridge MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
443-820 5 Elkridge MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-820 6 Elkridge MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-820 7 Elkridge MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-820 8 Elkridge MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-820 9 Elkridge MD BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.