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.

Ellicott City, MD

<< 1 2 3 4 5 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
443-574 1   829J PAETEC ITEL, LLC 238      
443-574 2   829J PAETEC ITEL, LLC 238      
443-574 3   829J PAETEC ITEL, LLC 238      
443-574 4   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-10-28   
443-574 5   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-26   
443-574 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-08-19   
443-574 7   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-08-28   
443-574 8   829J PAETEC ITEL, LLC 238   2003-05-25   
443-574 9   829J PAETEC ITEL, LLC 238      
443-638 A BLTMMDDN4MD  2554 GLOBAL NAPS SOUTH, INC. - MD 238      
443-828 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-828 0   829J PAETEC ITEL, LLC 238      
443-828 1   829J PAETEC ITEL, LLC 238      
443-828 2   515J IP HORIZON LLC 238   2013-09-06   
443-828 3   829J PAETEC ITEL, LLC 238      
443-828 4   829J PAETEC ITEL, LLC 238      
443-828 5   829J PAETEC ITEL, LLC 238      
443-828 6   829J PAETEC ITEL, LLC 238      
443-828 7   508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-828 8   829J PAETEC ITEL, LLC 238      
443-828 9   829J PAETEC ITEL, LLC 238      
443-973 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-973 0   071F BANDWIDTH.COM CLEC, LLC - MD 238   2024-10-26   
443-973 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-10-18   
443-973 2   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-03-21   
443-973 3   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-973 4   876D ONVOY, LLC - MD 238   2014-09-05   
443-973 5   876D ONVOY, LLC - MD 238   2014-10-17   
443-973 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-02   
443-973 7   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-973 8   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-973 9   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2001-11-19   
667-280 A BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-280 0   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2021-03-12   
667-280 1   624H ONVOY SPECTRUM, LLC 238   2021-11-20   
667-280 3   197D VONAGE AMERICA LLC 238   2020-06-19   
667-280 4   876D ONVOY, LLC - MD 238   2021-03-04   
667-280 5   876D ONVOY, LLC - MD 238   2021-03-04   
667-280 6   876D ONVOY, LLC - MD 238   2021-03-04   
667-280 7   197D VONAGE AMERICA LLC 238   2020-06-19   
667-280 8   624H ONVOY SPECTRUM, LLC 238   2021-05-22   
667-280 9   876D ONVOY, LLC - MD 238   2021-09-23   
667-371 A   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-371 0   071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-09-30   
667-371 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2023-03-10   
667-371 2   876D ONVOY, LLC - MD 238   2023-08-10   
667-371 3   624H ONVOY SPECTRUM, LLC 238   2022-03-21   
667-371 4   624H ONVOY SPECTRUM, LLC 238   2022-03-21   
667-371 5   876D ONVOY, LLC - MD 238   2023-08-10   
667-371 6   624H ONVOY SPECTRUM, LLC 238   2022-02-07   

<< 1 2 3 4 5 >>

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.