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Ellicott City, MD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-203 A ELCYMDELDS0  9212 VERIZON MARYLAND, INC. 238      
410-313 A ELCYMDELDS0  9212 VERIZON MARYLAND, INC. 238      
410-418 A ELCYMDELDS0  9212 VERIZON MARYLAND, INC. 238      
410-442 A GLWDMDGDRS1  9212 VERIZON MARYLAND, INC. 238      
410-442 0   9212 VERIZON MARYLAND, INC. 238      
410-442 1   9212 VERIZON MARYLAND, INC. 238      
410-442 2   9212 VERIZON MARYLAND, INC. 238      
410-442 3   9212 VERIZON MARYLAND, INC. 238      
410-442 4   9212 VERIZON MARYLAND, INC. 238      
410-442 5   9212 VERIZON MARYLAND, INC. 238      
410-442 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-22   
410-442 7   9212 VERIZON MARYLAND, INC. 238      
410-442 8   9212 VERIZON MARYLAND, INC. 238      
410-442 9   9212 VERIZON MARYLAND, INC. 238      
410-461 A ELCYMDELDS0  9212 VERIZON MARYLAND, INC. 238      
410-465 A ELCYMDELDS0  9212 VERIZON MARYLAND, INC. 238      
410-480 A ELCYMDELDS0  9212 VERIZON MARYLAND, INC. 238      
410-505 A CLMAMDOBDS0  9212 VERIZON MARYLAND, INC. 238      
410-505 0   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2015-10-15   
410-505 1   4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238   2004-02-14   
410-505 2   9212 VERIZON MARYLAND, INC. 238   2003-03-06   
410-505 3   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-03-29   
410-505 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-02-20   
410-505 5   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2002-07-21   
410-505 6   9212 VERIZON MARYLAND, INC. 238      
410-505 7   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2020-02-26   
410-505 8   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2004-11-22   
410-505 9   829J PAETEC ITEL, LLC 238   2004-03-27   
410-680 A BLTMMDDNDS2  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-680 0   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-680 1   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-680 2   876D ONVOY, LLC - MD 238   2016-02-15   
410-680 3   876D ONVOY, LLC - MD 238   2016-02-15   
410-680 4   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-680 5   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-680 6   281E YMAX COMMUNICATIONS CORP. - MD 238   2009-10-05   
410-680 7   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-680 8   318J COMCAST IP PHONE, LLC 238   2012-11-26   
410-680 9   7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-696 A BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-696 0   515J IP HORIZON LLC 238   2016-05-31   
410-696 1   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-696 2   318J COMCAST IP PHONE, LLC 238   2005-03-10   
410-696 3   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2005-07-03   
410-696 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2009-10-09   
410-696 5   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-02-13   
410-696 6   2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238   2016-01-19   
410-696 7   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-16   
410-696 8   281E YMAX COMMUNICATIONS CORP. - MD 238   2009-02-11   
410-696 9   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-720 A CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-720 0   9212 VERIZON MARYLAND, INC. 238      
410-720 1   9212 VERIZON MARYLAND, INC. 238      
410-720 2   318J COMCAST IP PHONE, LLC 238   2007-07-30   
410-720 3   9212 VERIZON MARYLAND, INC. 238      
410-720 4   9212 VERIZON MARYLAND, INC. 238      
410-720 5   9212 VERIZON MARYLAND, INC. 238      
410-720 6   9212 VERIZON MARYLAND, INC. 238      
410-720 7   9212 VERIZON MARYLAND, INC. 238      
410-720 8   9212 VERIZON MARYLAND, INC. 238      
410-720 9   281E YMAX COMMUNICATIONS CORP. - MD 238   2007-08-20   
410-748 A HNVAMDAE3MD  6630 USA MOBILITY WIRELESS, INC. 238      
410-750 A ELCYMDELDS0  9212 VERIZON MARYLAND, INC. 238      
410-781 A SYVLMDSKDS0  9212 VERIZON MARYLAND, INC. 238      
410-781 0   9212 VERIZON MARYLAND, INC. 238      
410-781 1   876D ONVOY, LLC - MD 238   2016-03-10   
410-781 2   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2006-05-04   
410-781 3   876D ONVOY, LLC - MD 238   2024-04-13   
410-781 4   9212 VERIZON MARYLAND, INC. 238      
410-781 5   964H BARR TELL USA, INC. 238   2016-12-17   
410-781 6   9212 VERIZON MARYLAND, INC. 238      
410-781 7   9212 VERIZON MARYLAND, INC. 238      
410-781 8   281E YMAX COMMUNICATIONS CORP. - MD 238   2008-04-16   
410-781 9   145J TERRA NOVA TELECOM INC. 238   2024-02-15   
410-988 A CLVLMDCERP0  9212 VERIZON MARYLAND, INC. 238   2024-01-30   
410-988 0   281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-26   
410-988 1   829J PAETEC ITEL, LLC 238   2005-03-10   
410-988 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
410-988 3   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
410-988 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
410-988 5   318J COMCAST IP PHONE, LLC 238   2006-10-21   
410-988 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-09-03   
410-988 7   281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-26   
410-988 8   318J COMCAST IP PHONE, LLC 238   2015-11-25   
410-988 9   9212 VERIZON MARYLAND, INC. 238      
410-995 A CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-995 0   9212 VERIZON MARYLAND, INC. 238      
410-995 1   9212 VERIZON MARYLAND, INC. 238      
410-995 2   9212 VERIZON MARYLAND, INC. 238      
410-995 3   9212 VERIZON MARYLAND, INC. 238      
410-995 4   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
410-995 5   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
410-995 6   9212 VERIZON MARYLAND, INC. 238      
410-995 7   071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-09-08   
410-995 8   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-22   
410-995 9   876D ONVOY, LLC - MD 238   2016-03-27   
443-288 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-288 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-288 1   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-288 2   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      

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Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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