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.

Towson, MD

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
443-901 0 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
443-901 1 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
443-901 2 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
443-901 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2020-08-09   
443-901 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2020-08-09   
443-901 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2020-08-09   
443-901 6 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2020-06-30   
443-901 7 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
443-901 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2021-05-10   
443-901 9 PIVLMDPKXGX  829J PAETEC ITEL, LLC 238      
443-912 A BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-912 0 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-05-01   
443-912 1 BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238   2002-08-23   
443-912 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-05   
443-912 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-05   
443-912 4 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-05   
443-912 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-29   
443-912 6 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2008-03-11   
443-912 7 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-07   
443-912 8 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-07   
443-912 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-07   
443-921 A PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-921 0 PIVLMDPKXEX  829J PAETEC ITEL, LLC 238      
443-921 1 PIVLMDPKXEX  829J PAETEC ITEL, LLC 238      
443-921 2 PIVLMDPKXEX  829J PAETEC ITEL, LLC 238      
443-921 3 PIVLMDPKXEX  829J PAETEC ITEL, LLC 238      
443-921 4 PIVLMDPKXEX  829J PAETEC ITEL, LLC 238      
443-921 5 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-07   
443-921 6 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-07   
443-921 7 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-07   
443-921 8 PIVLMDPKXEX  829J PAETEC ITEL, LLC 238      
443-921 9 PIVLMDPKXEX  829J PAETEC ITEL, LLC 238      
443-935 A CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-935 0 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-09-21   
443-935 1 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-09-21   
443-935 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-09-25   
443-935 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-09-25   
443-935 4 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-09-25   
443-935 5 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-09-23   
443-935 6 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-09-23   
443-935 7 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-12-12   
443-935 8 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2007-02-20   
443-935 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2007-02-20   
443-991 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-991 0 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-11-15   
443-991 1 BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-06-14   
443-991 2 BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-06-14   
443-991 3 BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-06-14   
443-991 4 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-03-26   
443-991 5 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-04-14   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >>

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.