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
410-800 4 BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238   2005-08-30   
410-800 5 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-05-09   
410-800 6 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-05-09   
410-800 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-09-01   
410-800 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-09-01   
410-800 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-06-19   
410-801 A BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-801 0   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-02-15   
410-801 1   876D ONVOY, LLC - MD 238   2024-02-24   
410-801 2 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2017-04-06   
410-801 3 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2017-04-06   
410-801 4 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2017-04-06   
410-801 5 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2019-07-09   
410-801 6 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-08-12   
410-801 7 BLTMMDCHUMD  156J RCLEC, INC. 238   2017-03-02   
410-801 8 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2018-06-07   
410-801 9 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-08-12   
410-804 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-805 A   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-805 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-805 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-805 2 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-805 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-805 4 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-805 5 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-805 6 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-805 7 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-805 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-805 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-10-27   
410-814 A HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
410-814 0 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2005-12-21   
410-814 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-12-23   
410-814 2 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238   2005-11-21   
410-814 3 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238   2005-11-21   
410-814 4 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238   2005-11-21   
410-814 5 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238   2005-11-21   
410-814 6 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238   2005-11-21   
410-814 7 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238   2005-11-21   
410-814 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-02-03   
410-814 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-02-03   
410-826 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
410-826 0 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-18   
410-826 1 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-18   
410-826 2 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-18   
410-826 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-18   
410-826 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-18   
410-826 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-18   
410-826 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-18   
410-826 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-18   
410-826 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-18   

<< 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: LES.NET

Like this site? We accept donations via PayPal.