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
443-398 8 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2016-04-22   
443-398 9   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-516 A BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-516 0 BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-516 1 BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-516 2 BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238   2004-12-22   
443-516 3   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-516 4 BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-516 5   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2024-03-22   
443-516 6 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-09-19   
443-516 7 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-02   
443-516 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-28   
443-516 9 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-28   
443-609 A HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-609 0 HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-609 1 CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238   2003-03-02   
443-609 2 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-08-15   
443-609 3 BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238   2006-08-18   
443-609 4 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-01-19   
443-609 5 BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-609 6 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2018-02-26   
443-609 7 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-07-28   
443-609 8 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-609 9 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-920 A CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-920 0 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-07-28   
443-920 1   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-920 2   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-920 3 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2009-05-21   
443-920 4 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-06-07   
443-920 5 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-06-07   
443-920 6   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-920 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-25   
443-920 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-25   
443-920 9 CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-339 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-339 0 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-11-26   
667-339 1 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-11-26   
667-339 2 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-10-31   
667-339 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-10-31   
667-339 4 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-03-24   
667-339 5 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-03-24   
667-339 6 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-02-12   
667-339 7 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-02-12   
667-339 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-10-16   
667-339 9 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2023-08-10   
667-478 A   876D ONVOY, LLC - MD 238   2024-05-12   
667-478 0   876D ONVOY, LLC - MD 238   2024-05-12   
667-478 1   876D ONVOY, LLC - MD 238   2024-05-12   

<< 1 2 3

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.