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: 643

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-643 A Bel Air MD BLARMDBLDS0  9212 VERIZON MARYLAND, INC. 238      
443-643 0 Bel Air MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-643 1 Bel Air MD   9212 VERIZON MARYLAND, INC. 238      
443-643 2 Bel Air MD   9212 VERIZON MARYLAND, INC. 238      
443-643 3 Bel Air MD   9212 VERIZON MARYLAND, INC. 238      
443-643 4 Bel Air MD   9212 VERIZON MARYLAND, INC. 238      
443-643 5 Bel Air MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-08   
443-643 6 Bel Air MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-08   
443-643 7 Bel Air MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-08   
443-643 8 Bel Air MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-08   
443-643 9 Bel Air MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.