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.

Damascus, MD

<< 1 2 3

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-414 0   9212 VERIZON MARYLAND, INC. 236      
301-414 1   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-07-17   
301-414 2   9212 VERIZON MARYLAND, INC. 236      
301-414 3   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-07-17   
301-414 4   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-07-17   
301-414 5   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-414 6   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-414 7   9212 VERIZON MARYLAND, INC. 236      
301-414 8   876D ONVOY, LLC - MD 236   2016-03-11   
301-414 9   9212 VERIZON MARYLAND, INC. 236      
301-482 A DMSCMDDERP0  9212 VERIZON MARYLAND, INC. 236      
301-482 0   9212 VERIZON MARYLAND, INC. 236      
301-482 1   9212 VERIZON MARYLAND, INC. 236      
301-482 2   9212 VERIZON MARYLAND, INC. 236      
301-482 3   9212 VERIZON MARYLAND, INC. 236      
301-482 4   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-482 5   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-482 6   9212 VERIZON MARYLAND, INC. 236      
301-482 7   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-482 8   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-22   
301-482 9   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-685 A WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-685 0   876D ONVOY, LLC - MD 236   2012-10-06   
301-685 1   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2003-03-24   
301-685 2   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-685 3   829J PAETEC ITEL, LLC 236   2004-09-28   
301-685 4   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-685 5   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-01-04   
301-685 6   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-01-04   
301-685 7   876D ONVOY, LLC - MD 236   2016-03-11   
301-685 8   2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 236   2003-12-25   
301-685 9   7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      

<< 1 2 3

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.