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.

Port Deposit, MD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-378 A BNBRMDBRRS0  9212 VERIZON MARYLAND, INC. 238      
410-378 0   9212 VERIZON MARYLAND, INC. 238      
410-378 1   9212 VERIZON MARYLAND, INC. 238      
410-378 2   9212 VERIZON MARYLAND, INC. 238      
410-378 3   9212 VERIZON MARYLAND, INC. 238      
410-378 4   9212 VERIZON MARYLAND, INC. 238      
410-378 5   9212 VERIZON MARYLAND, INC. 238      
410-378 6   9212 VERIZON MARYLAND, INC. 238      
410-378 7   073H TELNYX LLC 238   2020-10-18   
410-378 8   9212 VERIZON MARYLAND, INC. 238      
410-378 9   9212 VERIZON MARYLAND, INC. 238      
443-227 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-227 0   073H TELNYX LLC 238   2017-04-26   
443-227 1   829J PAETEC ITEL, LLC 238      
443-227 2   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-07-07   
443-227 3   321J HD CARRIER LLC 238   2016-05-14   
443-227 4   876D ONVOY, LLC - MD 238   2016-03-17   
443-227 5   876D ONVOY, LLC - MD 238   2016-03-17   
443-227 6   321J HD CARRIER LLC 238   2016-05-14   
443-227 7   508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-227 8   321J HD CARRIER LLC 238   2016-05-14   
443-227 9   321J HD CARRIER LLC 238   2016-05-14   
443-731 A BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-731 0   876D ONVOY, LLC - MD 238   2024-03-03   
443-731 1   420C ARMSTRONG TELECOMMUNICATIONS, INC. - MD 238   2008-08-05   
443-731 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-03-05   
443-731 3   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-11-19   
443-731 4   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2017-08-03   
443-731 5   876D ONVOY, LLC - MD 238   2018-06-16   
443-731 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-731 7   321J HD CARRIER LLC 238   2016-05-14   
443-731 8   145J TERRA NOVA TELECOM INC. 238   2024-02-15   
443-731 9   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-747 A BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-747 0   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-04-02   
443-747 1   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-18   
443-747 2   829J PAETEC ITEL, LLC 238   2004-02-05   
443-747 3   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-747 4   228C IDT AMERICA, CORP. - MD 238   2012-01-08   
443-747 5   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2006-05-04   
443-747 6   321J HD CARRIER LLC 238   2016-05-14   
443-747 7   876D ONVOY, LLC - MD 238   2012-10-08   
443-747 8   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-747 9   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
667-396 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-396 0   071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-02-25   
667-396 1   624H ONVOY SPECTRUM, LLC 238   2022-02-05   
667-396 2   624H ONVOY SPECTRUM, LLC 238   2022-02-05   
667-396 3   624H ONVOY SPECTRUM, LLC 238   2021-05-23   
667-396 4   071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-01-01   
667-396 5   876D ONVOY, LLC - MD 238   2021-05-23   
667-396 6   876D ONVOY, LLC - MD 238   2021-05-22   
667-396 7   876D ONVOY, LLC - MD 238   2021-05-23   
667-396 8   876D ONVOY, LLC - MD 238   2021-05-23   
667-396 9   876D ONVOY, LLC - MD 238   2021-05-23   
667-398 A BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
667-398 0   071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-04-23   
667-398 1   071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-04-24   
667-398 2   318J COMCAST IP PHONE, LLC 238   2025-08-01   
667-398 8   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2024-05-18   
667-398 9   073H TELNYX LLC 238   2022-12-26   
667-837 A BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
667-837 0   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-12-07   
667-837 1   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-12-07   
667-837 2   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-08   
667-837 3   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-08   
667-837 4   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-12-07   
667-837 5   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-08   
667-837 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-08   
667-837 7   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-08   
667-837 8   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-08   
667-837 9   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-07-30   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.