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Ellicott City, MD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-720 A CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-720 0 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-720 1 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-720 2 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-30   
410-720 3 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-720 4 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-720 5 CLMAMDOBDS0  9212 VERIZON MARYLAND, INC. 238      
410-720 6 CLMAMDOBDS0  9212 VERIZON MARYLAND, INC. 238      
410-720 7 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-720 8 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-720 9 BLTMMDSNDS6  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 SYVLMDSKDS0  9212 VERIZON MARYLAND, INC. 238      
410-781 1 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-10   
410-781 2 BLTMMDCH25Z  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2006-05-04   
410-781 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-04-13   
410-781 4 SYVLMDSKDS0  9212 VERIZON MARYLAND, INC. 238      
410-781 5 BLTQMD012MD  964H BARR TELL USA, INC. 238   2016-12-17   
410-781 6 SYVLMDSKDS0  9212 VERIZON MARYLAND, INC. 238      
410-781 7 SYVLMDSKDS0  9212 VERIZON MARYLAND, INC. 238      
410-781 8 BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-04-16   
410-781 9 BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-02-15   
410-988 A CLVLMDCERP0  9212 VERIZON MARYLAND, INC. 238   2024-01-30   
410-988 0 BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-26   
410-988 1   829J PAETEC ITEL, LLC 238   2005-03-10   
410-988 2 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
410-988 3 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
410-988 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
410-988 5 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-10-21   
410-988 6 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-09-03   
410-988 7 BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-26   
410-988 8 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-11-25   
410-988 9 CLVLMDCERP0  9212 VERIZON MARYLAND, INC. 238      
410-995 A CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-995 0 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-995 1 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-995 2 CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-995 3 CLMAMDCBRP0  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 CLMAMDOBDS0  9212 VERIZON MARYLAND, INC. 238      
410-995 7 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-09-08   
410-995 8 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-22   
410-995 9 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-27   
443-288 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-288 0 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-288 1 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-288 2 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      

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Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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