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: 656

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-656 A Columbia MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-656 0 Columbia MD   829J PAETEC ITEL, LLC 238      
443-656 1 Columbia MD BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-05-22   
443-656 2 Columbia MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-01-08   
443-656 3 Columbia MD   829J PAETEC ITEL, LLC 238      
443-656 4 Columbia MD   829J PAETEC ITEL, LLC 238      
443-656 5 Columbia MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-01-08   
443-656 6 Columbia MD   829J PAETEC ITEL, LLC 238      
443-656 7 Columbia MD   829J PAETEC ITEL, LLC 238      
443-656 8 Columbia MD   829J PAETEC ITEL, LLC 238      
443-656 9 Columbia MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-07-11   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.