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.

Washington Zone 16, MD

<< 1 2 3 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
240-897 4   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-05-01   
240-897 5   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
240-897 6   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
240-897 7   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
240-897 8 WASHDC127MD  073H TELNYX LLC 236   2017-04-27   
240-897 9 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
240-949 A   829J PAETEC ITEL, LLC 236   2025-04-02   
240-949 0   829J PAETEC ITEL, LLC 236      
240-949 1 VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-06-11   
240-949 2 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-01-04   
240-949 3   829J PAETEC ITEL, LLC 236      
240-949 4 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2003-08-23   
240-949 5   829J PAETEC ITEL, LLC 236      
240-949 6 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-01-04   
240-949 7 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-05-05   
240-949 8   829J PAETEC ITEL, LLC 236      
240-949 9   829J PAETEC ITEL, LLC 236      
240-966 A ARTNVAARXJY  516J TON80 COMMUNICATIONS, LLC 236   2024-01-31   
240-966 0 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2022-09-22   
240-966 1 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2022-09-22   
240-966 2 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2022-07-19   
240-966 3 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2022-07-19   
240-966 4 VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-10-15   
240-966 5 VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-10-15   
240-966 6 ARTNVAARXJY  516J TON80 COMMUNICATIONS, LLC 236   2022-04-30   
240-966 7 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2023-06-15   
240-966 8 VINNVACBDS0  876D ONVOY, LLC - MD 236   2023-08-10   
240-966 9 WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2023-02-27   
301-234 A ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-234 0 ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-234 1   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-22   
301-234 2 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2021-12-09   
301-234 3   829J PAETEC ITEL, LLC 236   2017-10-06   
301-234 4   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-234 5   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-22   
301-234 6 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2008-05-16   
301-234 7 VINNVACBDS0  876D ONVOY, LLC - MD 236   2018-09-13   
301-234 8 VINNVACBDS0  876D ONVOY, LLC - MD 236   2018-09-13   
301-234 9   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-22   
301-235 A WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-235 0   2593 CORE COMMUNICATIONS, INC.- MD 236   2004-03-26   
301-235 1 VINNVACBDS0  876D ONVOY, LLC - MD 236   2019-02-19   
301-235 2 VINNVACBDS0  876D ONVOY, LLC - MD 236   2018-06-08   
301-235 3 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2015-09-02   
301-235 4   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-235 5 WASHDC126MD  964H BARR TELL USA, INC. 236   2018-05-08   
301-235 6 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2021-05-22   
301-235 7   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-235 8 VINNVACBDS0  876D ONVOY, LLC - MD 236   2019-02-19   
301-235 9 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-238 A TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-238 0 TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236   2001-12-21   
301-238 1 TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236   2004-07-10   
301-238 2 TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-238 3 TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-238 4   829J PAETEC ITEL, LLC 236   2005-02-08   
301-238 5   829J PAETEC ITEL, LLC 236   2007-02-23   
301-238 6   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-03-29   
301-238 7 VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-03-30   
301-238 8 VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-03-30   
301-238 9 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2021-05-22   
301-297 A ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-297 0 ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-297 1 ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-297 2 VINNVACBDS0  876D ONVOY, LLC - MD 236   2025-01-09   
301-297 3 VINNVACBDS0  876D ONVOY, LLC - MD 236   2021-04-02   
301-297 4 ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-297 5 ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-297 6 ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-297 7 ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-297 8 ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-297 9 ALTWMDATRP0  9212 VERIZON MARYLAND, INC. 236      
301-372 A BRNDMDBERS0  9212 VERIZON MARYLAND, INC. 236      
301-372 0 BRNDMDBERS0  9212 VERIZON MARYLAND, INC. 236      
301-372 1 BRNDMDBERS0  9212 VERIZON MARYLAND, INC. 236      
301-372 2 BRNDMDBERS0  9212 VERIZON MARYLAND, INC. 236      
301-372 3 BRNDMDBERS0  9212 VERIZON MARYLAND, INC. 236      
301-372 4   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-03-29   
301-372 5   829J PAETEC ITEL, LLC 236   2016-06-17   
301-372 6 BRNDMDBERS0  9212 VERIZON MARYLAND, INC. 236      
301-372 7 WASIDCRG7MD  508J CENTURYLINK COMMUNICATIONS, LLC 236   2014-06-25   
301-372 8 BRNDMDBERS0  9212 VERIZON MARYLAND, INC. 236      
301-372 9 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2021-05-22   
301-719 A WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-719 0   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-719 1 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-719 2 VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-04-30   
301-719 3 VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-04-30   
301-719 4 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2021-05-22   
301-719 5 WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2020-04-15   
301-719 6   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-22   
301-719 7   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-22   
301-719 8   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-719 9   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-22   
301-856 A CLTNMDCLDS0  9212 VERIZON MARYLAND, INC. 236      
301-868 A CLTNMDCLDS0  9212 VERIZON MARYLAND, INC. 236      
301-877 A CLTNMDCLDS0  9212 VERIZON MARYLAND, INC. 236      
301-888 A BADNMDBNRS0  9212 VERIZON MARYLAND, INC. 236      
301-888 0 VINNVACBDS0  876D ONVOY, LLC - MD 236   2017-07-19   
301-888 1 BADNMDBNRS0  9212 VERIZON MARYLAND, INC. 236      

<< 1 2 3 >>

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.