Local Calling Guide

Area code/prefix search

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Washington Zone 11, MD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-321 8   876D ONVOY, LLC - MD 236   2016-01-07   
301-321 9   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-24   
301-348 A WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-348 0   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-24   
301-348 1   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-348 2   2593 CORE COMMUNICATIONS, INC. - MD 236   2019-04-29   
301-348 3   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-348 4   2593 CORE COMMUNICATIONS, INC. - MD 236   2019-04-29   
301-348 5   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2017-08-03   
301-348 6   2593 CORE COMMUNICATIONS, INC. - MD 236   2012-08-26   
301-348 7   2593 CORE COMMUNICATIONS, INC. - MD 236   2019-07-30   
301-348 8   318J COMCAST IP PHONE LLC 236   2016-02-24   
301-348 9   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-24   
301-382 A RKVLMDMRDS0  9212 VERIZON MARYLAND, INC. 236      
301-413 A RKVLMDMRDS0  9212 VERIZON MARYLAND, INC. 236      
301-443 A RKVLMDMRRS1  9212 VERIZON MARYLAND, INC. 236      
301-460 A SLSPMDNBDS0  9212 VERIZON MARYLAND, INC. 236      
301-468 A RKVLMDMRDS0  9212 VERIZON MARYLAND, INC. 236      
301-522 A RKVLMDMRDS0  9212 VERIZON MARYLAND, INC. 236      
301-603 A SLSPMDNBDS0  9212 VERIZON MARYLAND, INC. 236      
301-603 0   9212 VERIZON MARYLAND, INC. 236      
301-603 1   9212 VERIZON MARYLAND, INC. 236      
301-603 2   318J COMCAST IP PHONE LLC 236   2016-07-13   
301-603 3   876D ONVOY, LLC - MD 236   2015-06-27   
301-603 4   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-24   
301-603 5   964H BARR TELL USA, INC. 236   2018-05-08   
301-603 6   2593 CORE COMMUNICATIONS, INC. - MD 236   2019-07-30   
301-603 7   9212 VERIZON MARYLAND, INC. 236      
301-603 8   9212 VERIZON MARYLAND, INC. 236      
301-603 9   9212 VERIZON MARYLAND, INC. 236      
301-649 A SLSPMDNWDS0  9212 VERIZON MARYLAND, INC. 236      
301-692 A WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-692 0   7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-692 1   7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-692 2   7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-692 3   7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-692 4   7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-692 5   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-24   
301-692 6   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-24   
301-692 7   508J CENTURYLINK COMMUNICATIONS LLC 236   2013-10-01   
301-692 8   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-24   
301-692 9   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-24   
301-761 A MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-761 0   2593 CORE COMMUNICATIONS, INC. - MD 236   2004-03-26   
301-761 1   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2004-12-29   
301-761 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2014-04-19   
301-761 3   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2004-12-29   
301-761 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-761 5   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2014-02-21   
301-761 6   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2014-11-22   

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Last updated: Sun, 04 Apr 2021 19:28:27 UTC

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