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.

Baltimore, MD

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
443-447 9 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-04-01   
443-449 A PIVLMDPKFMD  9170 BROADVIEW NETWORKS, INC. - MD 238      
443-449 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-07-22   
443-449 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-07-22   
443-449 2 PIVLMDPKFMD  9170 BROADVIEW NETWORKS, INC. - MD 238   2007-05-19   
443-449 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-04-08   
443-449 4 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-449 5 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-27   
443-449 6 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-27   
443-449 7 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-27   
443-449 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-08-17   
443-449 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-08-17   
443-451 A BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-452 A CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-452 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-02-07   
443-452 1 CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238   2005-10-30   
443-452 2   876D ONVOY, LLC - MD 238   2024-02-24   
443-452 3   876D ONVOY, LLC - MD 238   2024-02-24   
443-452 4 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-10-31   
443-452 5   876D ONVOY, LLC - MD 238   2024-02-24   
443-452 6   876D ONVOY, LLC - MD 238   2024-02-24   
443-452 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-02-03   
443-452 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-02-03   
443-452 9 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-02-03   
443-453 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-453 0 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2007-12-03   
443-453 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 2 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 4 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 5 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-16   
443-453 6 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 7 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 9 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2008-06-09   
443-455 A BLTMMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
443-455 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-455 1 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2009-10-12   
443-455 2 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-07-04   
443-455 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-07-04   
443-455 4 BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2023-11-16   
443-455 5 BLTMMDWLDS0  9212 VERIZON MARYLAND, INC. 238   2006-06-14   
443-455 6 BLTMMDWLDS0  9212 VERIZON MARYLAND, INC. 238   2006-06-19   
443-455 7 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-07-04   
443-455 8 BLTMMDWLDS0  9212 VERIZON MARYLAND, INC. 238   2006-06-14   
443-455 9   876D ONVOY, LLC - MD 238   2024-02-24   
443-462 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-462 0 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-01-15   
443-462 1 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-04-02   
443-462 2 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-04-02   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 >>

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.