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.

Sykesville, MD

1 2 3 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-549 A SYVLMDSKDS0  9212 VERIZON MARYLAND, INC. 238      
410-552 A SYVLMDSKDS0  9212 VERIZON MARYLAND, INC. 238      
410-552 0   9212 VERIZON MARYLAND, INC. 238      
410-552 1   9212 VERIZON MARYLAND, INC. 238      
410-552 2   9212 VERIZON MARYLAND, INC. 238      
410-552 3   9212 VERIZON MARYLAND, INC. 238      
410-552 4   9212 VERIZON MARYLAND, INC. 238      
410-552 5   9212 VERIZON MARYLAND, INC. 238      
410-552 6   9212 VERIZON MARYLAND, INC. 238      
410-552 7   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
410-552 8   318J COMCAST IP PHONE LLC 238   2012-05-20   
410-552 9   9212 VERIZON MARYLAND, INC. 238      
410-795 A SYVLMDSKDS0  9212 VERIZON MARYLAND, INC. 238      
410-875 A WMNSMDWMDS0  9212 VERIZON MARYLAND, INC. 238      
410-875 0   9212 VERIZON MARYLAND, INC. 238      
410-875 1   9212 VERIZON MARYLAND, INC. 238      
410-875 2   9212 VERIZON MARYLAND, INC. 238      
410-875 3   9212 VERIZON MARYLAND, INC. 238      
410-875 4   9212 VERIZON MARYLAND, INC. 238      
410-875 5   9212 VERIZON MARYLAND, INC. 238      
410-875 6   9212 VERIZON MARYLAND, INC. 238      
410-875 7   318J COMCAST IP PHONE LLC 238   2013-10-03   
410-875 8   1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-03-27   
410-875 9   9212 VERIZON MARYLAND, INC. 238      
410-970 A BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-970 0   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-04-08   
410-970 1   145J TERRA NOVA TELECOM INC. 238   2021-01-28   
410-970 2   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-970 3   876D ONVOY, LLC - MD 238   2021-05-21   
410-970 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-03-24   
410-970 5   4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238   2004-02-14   
410-970 6   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-02-14   
410-970 7   9212 VERIZON MARYLAND, INC. 238   2004-06-20   
410-970 8   2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238   2003-12-25   
410-970 9   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-984 A BLTMMDCH40Z  6664 SPRINT SPECTRUM, L.P. 238      
443-277 A BLTMMDCH40Z  6664 SPRINT SPECTRUM, L.P. 238      
443-280 A CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-280 0   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-280 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-280 2   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-280 3   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-280 4   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-280 5   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-280 6   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-06-26   
443-280 7   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-280 8   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-10-01   
443-280 9   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-300 A BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-300 0   876D ONVOY, LLC - MD 238   2021-07-12   

1 2 3 >>

Last updated: Fri, 01 Jul 2022 02:53:40 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.