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.

Waterloo, MD

<< 1 2 3 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
443-733 A CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-733 0 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2003-02-16   
443-733 1 CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238   2003-03-04   
443-733 2 BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238   2009-03-17   
443-733 3 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-733 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-28   
443-733 5 PIVLMDPKQMD  9170 BROADVIEW NETWORKS, INC. - MD 238   2013-10-10   
443-733 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-28   
443-733 7   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-733 8   515J IP HORIZON LLC 238   2016-05-31   
443-733 9 CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-737 A BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-737 0 BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-737 1 BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-737 2 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-07-16   
443-737 3   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-737 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2004-02-07   
443-737 5   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-737 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-21   
443-737 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-21   
443-737 8   515J IP HORIZON LLC 238   2015-03-21   
443-737 9 BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-755 A EKRGMDELDS0  9212 VERIZON MARYLAND, INC. 238      
443-755 0 EKRGMDELDS0  9212 VERIZON MARYLAND, INC. 238      
443-755 1 EKRGMDELDS0  9212 VERIZON MARYLAND, INC. 238      
443-755 2 BLTMMDCHXVX  321J HD CARRIER LLC 238   2016-05-14   
443-755 3 BLTMMDCHYMD  530H WIDE VOICE, LLC - MD 238   2016-05-14   
443-755 4 BLTMMDCHXVX  321J HD CARRIER LLC 238   2016-05-14   
443-755 5 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-08-19   
443-755 6 BLTMMDCHYMD  530H WIDE VOICE, LLC - MD 238   2016-05-14   
443-755 7 BLTMMDCHYMD  530H WIDE VOICE, LLC - MD 238   2016-05-14   
443-755 8 EKRGMDELDS0  9212 VERIZON MARYLAND, INC. 238      
443-755 9 EKRGMDELDS0  9212 VERIZON MARYLAND, INC. 238      
443-899 A BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-899 0 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-11-26   
443-899 1 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-05-21   
443-899 2 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-06-26   
443-899 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-07-12   
443-899 4 BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-899 5   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-899 6   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-899 7 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-899 8 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-899 9 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
667-374 A BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
667-374 0 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-02-05   
667-374 1 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-03-11   
667-374 2 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-04-21   
667-374 6 BLTQMD01BMD  516J TON80 COMMUNICATIONS, LLC 238   2022-03-26   
667-374 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-09-25   

<< 1 2 3 >>

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.