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
667-217 1   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-01-10   
667-217 2   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-01-10   
667-217 3   829J PAETEC ITEL, LLC 238   2014-05-01   
667-217 4   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-01-10   
667-217 5   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-01-10   
667-217 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-01-10   
667-217 7   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
667-217 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
667-217 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
667-218 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
667-218 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-07   
667-218 1   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
667-218 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2015-08-01   
667-218 3   876D ONVOY, LLC - MD 238   2015-04-06   
667-218 4   876D ONVOY, LLC - MD 238   2015-04-06   
667-218 5   876D ONVOY, LLC - MD 238   2015-04-06   
667-218 6   829J PAETEC ITEL, LLC 238   2016-05-07   
667-218 7   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2015-08-12   
667-218 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-04-12   
667-218 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-04-12   
667-219 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
667-219 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-07   
667-219 1   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-04-12   
667-219 2   829J PAETEC ITEL, LLC 238   2015-03-30   
667-219 3   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2015-06-13   
667-219 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2015-06-13   
667-219 5   071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-08-15   
667-219 6   829J PAETEC ITEL, LLC 238   2015-06-30   
667-219 7   829J PAETEC ITEL, LLC 238   2015-06-30   
667-219 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-04-12   
667-219 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-04-12   
667-223 A BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-223 0   197D VONAGE AMERICA LLC 238   2017-10-07   
667-223 1   197D VONAGE AMERICA LLC 238   2017-10-07   
667-223 2   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-19   
667-223 3   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-19   
667-223 4   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-19   
667-223 5   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-19   
667-223 6   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-19   
667-223 7   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-19   
667-223 8   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-19   
667-223 9   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-19   
667-224 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
667-224 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-07   
667-224 1   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-04-12   
667-224 2   829J PAETEC ITEL, LLC 238   2015-04-20   
667-224 3   829J PAETEC ITEL, LLC 238   2015-04-20   
667-224 4   829J PAETEC ITEL, LLC 238   2015-04-20   
667-224 5   829J PAETEC ITEL, LLC 238   2015-04-20   
667-224 6   829J PAETEC ITEL, LLC 238   2015-06-29   
667-224 7   829J PAETEC ITEL, LLC 238   2015-06-29   
667-224 8   829J PAETEC ITEL, LLC 238   2015-06-30   
667-224 9   829J PAETEC ITEL, LLC 238   2015-06-30   
667-233 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
667-233 0   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-233 1   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-233 2   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-233 3   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-233 4   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-233 5   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-233 6   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-233 7   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-233 8   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-233 9   9212 VERIZON MARYLAND, INC. 238   2015-03-15   
667-234 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
667-234 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-07   
667-234 1   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2015-06-08   
667-234 2   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2015-06-08   
667-234 3   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2015-06-08   
667-234 4   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2015-06-08   
667-234 5   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2015-06-08   
667-234 6   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2015-06-08   
667-234 7   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2015-06-08   
667-234 8   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2015-06-08   
667-234 9   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-10-09   
667-239 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
667-239 0   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-07   
667-239 1   876D ONVOY, LLC - MD 238   2015-07-27   
667-239 2   876D ONVOY, LLC - MD 238   2015-07-27   
667-239 3   318J COMCAST IP PHONE, LLC 238   2014-09-29   
667-239 4   876D ONVOY, LLC - MD 238   2015-07-27   
667-239 5   876D ONVOY, LLC - MD 238   2015-07-27   
667-239 6   876D ONVOY, LLC - MD 238   2015-07-27   
667-239 7   876D ONVOY, LLC - MD 238   2015-07-27   
667-239 8   876D ONVOY, LLC - MD 238   2014-10-06   
667-239 9   876D ONVOY, LLC - MD 238   2014-10-06   
667-250 A BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238      
667-250 0   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-12-31   
667-250 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-10-06   
667-250 2   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-10-06   
667-250 3   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-10-06   
667-250 4   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-10-06   
667-250 5   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-10-06   
667-250 6   624H ONVOY SPECTRUM, LLC 238   2018-07-30   
667-250 7   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-250 8   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-250 9   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-258 A BLTQMD017MD  996H AIRESPRING, INC. 238      
667-258 0   996H AIRESPRING, INC. 238   2018-12-29   
667-258 1   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-12   

<< 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: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.