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.

Dundalk, MD

1 2 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-282 A DNDLMDDNDS0  9212 VERIZON MARYLAND, INC. 238      
410-284 A DNDLMDDNDS0  9212 VERIZON MARYLAND, INC. 238      
410-285 A DNDLMDDNDS0  9212 VERIZON MARYLAND, INC. 238      
410-288 A DNDLMDDNDS0  9212 VERIZON MARYLAND, INC. 238      
410-650 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
410-650 0 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
410-650 1 BLTMMDCH25Z  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238      
410-650 2 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-650 3 BLTMMDCH08Z  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238      
410-650 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
410-650 5 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
410-650 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
410-650 7 BLTMMDDNDS2  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
410-650 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
410-650 9 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-216 A HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-216 0   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-216 1 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-216 2 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-216 3 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-216 4 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-216 5 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-216 6 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-216 7 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-216 8 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-216 9 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-376 A BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-376 0 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-376 1   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-376 2   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-376 3 BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-376 4 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-376 5 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-376 6 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-376 7 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-376 8 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-376 9   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-399 A BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-399 0   876D ONVOY, LLC - MD 238      
443-399 1   876D ONVOY, LLC - MD 238      
443-399 2 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-399 3 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-399 4 BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-399 5 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238      
443-399 6 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-399 7 BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238      
443-399 8 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-399 9   515J IP HORIZON LLC 238      
443-407 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-407 0 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-407 1 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-407 2 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-407 3 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238      
443-407 4 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-407 5 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-407 6 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-407 7 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-407 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-407 9 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-503 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-503 0 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-503 1 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-503 2 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-503 3 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-503 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-503 5 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-503 6 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-503 7 PIVLMDPKFMD  9170 BROADVIEW NETWORKS, INC. - MD 238      
443-503 8 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-503 9 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-530 A BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-530 0 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238      
443-530 1 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238      
443-530 2   515J IP HORIZON LLC 238      
443-530 3 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-530 4 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-530 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-530 6 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-530 7 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-530 8 BLTMMDCHX7X  073H TELNYX LLC 238      
443-530 9 BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-549 A CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-549 0 CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-549 1 CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-549 2 CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-549 3 CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-549 4 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-549 5 BLTQMD012MD  964H BARR TELL USA, INC. 238      
443-549 6   145J TERRA NOVA TELECOM INC. 238      
443-549 7   071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-549 8   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-549 9 CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-586 A   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-586 0   876D ONVOY, LLC - MD 238      
443-586 1   876D ONVOY, LLC - MD 238      
443-586 2   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-586 3   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-586 4   2593 CORE COMMUNICATIONS, INC.- MD 238      
443-586 5 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-586 6 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      

1 2 >>

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.