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.

Thurmont, MD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
227-247 A CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2024-08-15   
227-247 0 CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2024-08-15   
240-288 A FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240      
240-288 0 FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240   2022-03-10   
240-288 1 HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2010-09-04   
240-288 2 CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2024-03-07   
240-288 3 HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2014-05-10   
240-288 4 FRDRMDFRAMD  2589 US LEC OF MARYLAND, INC. 240   2014-11-03   
240-288 5 HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2015-03-06   
240-288 6 FRDRMDFRXAX  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 240   2012-07-20   
240-288 7 FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2015-04-03   
240-288 8 FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2007-04-07   
240-288 9 HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2015-10-26   
240-451 A CMLDMDCMEMD  876D ONVOY, LLC - MD 240      
240-451 0 HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2017-07-31   
240-451 1 HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2017-07-31   
240-451 2 FRDRMDFRX7X  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 240   2018-07-12   
240-451 3   2593 CORE COMMUNICATIONS, INC.- MD 240   2018-06-17   
240-451 4   2593 CORE COMMUNICATIONS, INC.- MD 240   2018-06-17   
240-451 5   2593 CORE COMMUNICATIONS, INC.- MD 240   2018-06-17   
240-451 6 HGTWMD530MD  073H TELNYX LLC 240   2017-08-08   
240-451 7 FRDRMDFRXKX  508J CENTURYLINK COMMUNICATIONS, LLC 240   2016-10-28   
240-451 8 CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2016-10-02   
240-451 9 CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2016-10-02   
240-874 A CMLDMDCMEMD  876D ONVOY, LLC - MD 240      
240-874 0 CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2024-05-03   
240-874 1 FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240   2022-01-17   
240-874 2 FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240   2022-07-03   
240-874 3 FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240   2021-05-24   
240-874 4 CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2021-03-04   
240-874 5 CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2021-03-04   
240-874 6 FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240   2022-01-17   
240-874 7 CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2019-12-11   
240-874 8 CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2019-12-11   
240-874 9 HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240   2021-11-29   
301-271 A THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      
301-271 0 THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      
301-271 1 THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      
301-271 2 THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      
301-271 3 THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      
301-271 4 THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      
301-271 5 THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      
301-271 6 THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      
301-271 7 THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      
301-271 8   2593 CORE COMMUNICATIONS, INC.- MD 240   2004-03-28   
301-271 9 THRMMDTHRS0  9212 VERIZON MARYLAND, INC. 240      

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.