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 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
667-515 4   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 5   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 6   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 7   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 8   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 9   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-600 A BLTMMDCHXMD  139F WORLDCALL INTERCONNECT INC. 238      
667-600 0 BLTMMDCHXMD  139F WORLDCALL INTERCONNECT INC. 238   2015-11-13   
667-600 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-02-06   
667-600 2   829J PAETEC ITEL, LLC 238   2016-07-28   
667-600 3   829J PAETEC ITEL, LLC 238   2016-07-28   
667-600 4   829J PAETEC ITEL, LLC 238   2016-07-28   
667-600 5 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2020-04-17   
667-600 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-02   
667-600 7 BLTMMDCHXVX  321J HD CARRIER LLC 238   2020-05-02   
667-600 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-02-06   
667-600 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-02-06   
667-677 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-677 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-02-06   
667-677 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-02-06   
667-677 2   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-12   
667-677 3   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-12   
667-677 4   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-12   
667-677 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-06-09   
667-677 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-06-09   
667-677 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-06-09   
667-677 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-06-09   
667-677 9 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2016-11-05   
667-770 A BLTMMD915MD  691H AIRUS, INC. - MD 238      
667-770 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-11-09   
667-770 1 BLTMMD915MD  691H AIRUS, INC. - MD 238   2015-09-21   
667-770 2 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-11-09   
667-770 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-11-09   
667-770 4 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-11-09   
667-770 5 BLTMMDCHXVX  321J HD CARRIER LLC 238   2020-05-02   
667-770 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2019-06-13   
667-770 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2019-06-13   
667-770 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-11-09   
667-770 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-11-09   
667-771 A BLTMMDCHYMD  530H WIDE VOICE, LLC - MD 238      
667-771 0 BLTMMDCHPMD  820C INTRADO COMMUNICATIONS, LLC 238   2016-08-20   
667-771 1 BLTMMDCHYMD  530H WIDE VOICE, LLC - MD 238   2016-02-04   
667-771 2 BLTMMDCHDMD  551G NUSO, LLC 238   2016-08-31   
667-771 3 BLTMMDCHDMD  551G NUSO, LLC 238   2016-08-31   
667-771 4 BLTMMDCHDMD  551G NUSO, LLC 238   2016-08-31   
667-771 5 BLTMMDCHDMD  551G NUSO, LLC 238   2016-08-31   
667-771 6 BLTMMDCHDMD  551G NUSO, LLC 238   2016-08-31   
667-771 7 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2016-11-05   
667-771 8 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2016-11-05   
667-771 9   515J IP HORIZON LLC 238   2016-05-31   
667-776 A BLTMMDCHXVX  321J HD CARRIER LLC 238      
667-776 0 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2019-12-28   
667-776 1 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2020-04-08   
667-776 2 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2020-04-08   
667-776 3 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2020-04-08   
667-776 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2020-04-08   
667-776 5 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2020-04-08   
667-776 6 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2020-04-08   
667-776 7 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2020-04-08   
667-776 8 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2020-04-08   
667-776 9 BLTMMDCHXVX  321J HD CARRIER LLC 238   2019-11-15   
667-867 A BLTQMD013MD  939H COMMIO, LLC 238      
667-867 0 BLTMMDCHDMD  551G NUSO, LLC 238   2018-10-14   
667-867 1 BLTMMDCHDMD  551G NUSO, LLC 238   2018-10-14   
667-867 2   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
667-867 3   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
667-867 4   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
667-867 5 BLTQMD013MD  939H COMMIO, LLC 238   2017-08-11   
667-867 6   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
667-867 7   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
667-867 8   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
667-867 9   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
667-888 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-888 0 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-27   
667-888 1 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-27   
667-888 2 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-27   
667-888 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-27   
667-888 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-27   
667-888 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-27   
667-888 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-27   
667-888 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-27   
667-888 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-09-26   
667-888 9 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-07-27   
667-895 A BLTMMDCHXMX  506J TWILIO INTERNATIONAL, INC. 238      
667-895 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2021-09-06   
667-895 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2021-09-03   
667-895 2 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-11-12   
667-895 3 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2021-03-19   
667-895 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2021-03-19   
667-895 5 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2021-07-12   
667-895 6 BLTMMDCHCMD  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2020-12-14   
667-895 7 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2021-09-23   
667-895 8 BLTMMDCHXMX  506J TWILIO INTERNATIONAL, INC. 238   2020-12-13   
667-895 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2021-09-03   
667-899 A BLTQMD01AMD  965H FRACTEL, LLC 238      
667-899 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2022-02-24   
667-899 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2022-02-24   
667-899 2 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2022-02-24   
667-899 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-05-15   
667-899 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-05-22   

<< 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 >>

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.