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.

Arbutus, MD

<< 1 2 3 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
443-304 9   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-27   
443-443 A BLTQMD013MD  939H COMMIO, LLC 238   2024-01-22   
443-443 0   939H COMMIO, LLC 238   2024-01-22   
443-443 1   939H COMMIO, LLC 238   2024-01-22   
443-443 2   939H COMMIO, LLC 238   2024-01-22   
443-443 3   939H COMMIO, LLC 238   2024-01-22   
443-443 4   939H COMMIO, LLC 238   2024-01-22   
443-443 5   876D ONVOY, LLC - MD 238   2024-03-08   
443-443 6   876D ONVOY, LLC - MD 238   2024-04-13   
443-443 7   876D ONVOY, LLC - MD 238   2026-01-12   
443-443 8   876D ONVOY, LLC - MD 238   2024-07-15   
443-443 9   876D ONVOY, LLC - MD 238   2024-07-15   
443-543 A ARBTMDARDS0  9212 VERIZON MARYLAND, INC. 238      
443-543 0   9212 VERIZON MARYLAND, INC. 238      
443-543 1   9212 VERIZON MARYLAND, INC. 238      
443-543 2   9212 VERIZON MARYLAND, INC. 238      
443-543 3   9212 VERIZON MARYLAND, INC. 238      
443-543 4   939H COMMIO, LLC 238   2021-07-05   
443-543 5   9212 VERIZON MARYLAND, INC. 238      
443-543 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-07-02   
443-543 7   624H ONVOY SPECTRUM, LLC 238   2021-11-26   
443-543 8   876D ONVOY, LLC - MD 238   2014-10-06   
443-543 9   876D ONVOY, LLC - MD 238   2014-10-06   
443-568 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-568 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-568 1   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-568 2   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-568 3   876D ONVOY, LLC - MD 238   2012-10-07   
443-568 4   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-568 5   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-568 6   939H COMMIO, LLC 238   2021-06-12   
443-568 7   321J HD CARRIER LLC 238   2020-05-01   
443-568 8   071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-09-08   
443-568 9   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-575 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-575 0   829J PAETEC ITEL, LLC 238      
443-575 1   624H ONVOY SPECTRUM, LLC 238   2021-02-24   
443-575 2   829J PAETEC ITEL, LLC 238      
443-575 3   624H ONVOY SPECTRUM, LLC 238   2021-02-24   
443-575 4   829J PAETEC ITEL, LLC 238   2006-11-09   
443-575 5   829J PAETEC ITEL, LLC 238      
443-575 6   318J COMCAST IP PHONE, LLC 238   2007-04-10   
443-575 7   829J PAETEC ITEL, LLC 238   2011-12-20   
443-575 8   624H ONVOY SPECTRUM, LLC 238   2021-02-24   
443-575 9   624H ONVOY SPECTRUM, LLC 238   2021-05-23   
443-701 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-701 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-701 1   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-701 2   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-701 3   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-01-08   
443-701 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-08-26   
443-701 5   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-01-08   
443-701 6   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2023-02-20   
443-701 8   939H COMMIO, LLC 238   2021-06-12   
443-701 9   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-02-10   
443-709 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-709 0   829J PAETEC ITEL, LLC 238   2001-11-05   
443-709 1   624H ONVOY SPECTRUM, LLC 238   2021-12-30   
443-709 2   829J PAETEC ITEL, LLC 238   2001-11-05   
443-709 3   829J PAETEC ITEL, LLC 238   2001-11-05   
443-709 4   829J PAETEC ITEL, LLC 238   2001-11-05   
443-709 5   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-02-11   
443-709 6   624H ONVOY SPECTRUM, LLC 238   2021-05-23   
443-709 7   5562 METROPCS, INC. 238   2013-06-14   
443-709 8   071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-09-08   
443-709 9   829J PAETEC ITEL, LLC 238   2001-11-05   
443-785 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-833 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-833 0   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-04-19   
443-833 1   829J PAETEC ITEL, LLC 238   2002-11-19   
443-833 2   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2014-11-01   
443-833 3   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-833 4   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-11-17   
443-833 5   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-08-29   
443-833 6   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2016-06-04   
443-833 7   5562 METROPCS, INC. 238   2013-06-14   
443-833 8   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-833 9   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
667-386 A BLTMMDCH40Z  5562 METROPCS, INC. 238      
667-386 0   5562 METROPCS, INC. 238   2022-02-04   
667-386 1   073H TELNYX LLC 238   2022-03-24   
667-386 2   5562 METROPCS, INC. 238   2023-01-28   
667-386 3   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2023-03-04   
667-386 4   5562 METROPCS, INC. 238   2023-03-04   
667-386 5   5562 METROPCS, INC. 238   2023-03-24   
667-386 6   516J TON80 COMMUNICATIONS, LLC 238   2022-03-30   
667-386 7   5562 METROPCS, INC. 238   2023-03-24   
667-386 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2025-10-20   
667-386 9   5562 METROPCS, INC. 238   2022-02-04   
667-431 A BLTMMDCH40Z  5562 METROPCS, INC. 238      
667-431 0   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2023-08-05   
667-431 1   876D ONVOY, LLC - MD 238   2023-08-10   
667-431 2   876D ONVOY, LLC - MD 238   2023-08-10   
667-431 3   876D ONVOY, LLC - MD 238   2023-08-10   
667-431 4   876D ONVOY, LLC - MD 238   2023-08-10   
667-431 5   876D ONVOY, LLC - MD 238   2023-08-10   
667-431 6   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2023-09-09   
667-431 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2023-06-17   
667-431 9   5562 METROPCS, INC. 238   2023-06-17   
667-498 A BLTMMDCH57Z  7421 AT&T - LOCAL 238   2025-01-17   

<< 1 2 3 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.