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.
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Ridgely, MD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-634 A HLBOMDTKRS0  9212 VERIZON MARYLAND, INC. 242      
410-634 0 SLBRMDSBX0X  624H ONVOY SPECTRUM, LLC 242      
410-634 1 HLBOMDTKRS0  9212 VERIZON MARYLAND, INC. 242      
410-634 2 HLBOMDTKRS0  9212 VERIZON MARYLAND, INC. 242      
410-634 3   2593 CORE COMMUNICATIONS, INC.- MD 242      
410-634 4 ESTNMDESMMD  228C IDT AMERICA, CORP. - MD 242      
410-634 5   2593 CORE COMMUNICATIONS, INC.- MD 242      
410-634 6 SLBRMD902MD  073H TELNYX LLC 242      
410-634 7 SLBRMDSBXVX  876D ONVOY, LLC - MD 242      
410-634 8 SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242      
410-634 9 HLBOMDTKRS0  9212 VERIZON MARYLAND, INC. 242      
667-241 A ESTNMDBNGT0  2593 CORE COMMUNICATIONS, INC.- MD 242      
667-241 0   2593 CORE COMMUNICATIONS, INC.- MD 242      
667-241 1   2593 CORE COMMUNICATIONS, INC.- MD 242      
667-241 2   2593 CORE COMMUNICATIONS, INC.- MD 242      
667-241 4 SLBRMDSBXVX  876D ONVOY, LLC - MD 242      
667-241 5 SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
667-241 6 SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
667-241 7 SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
667-241 8 SLBRMDSBXVX  876D ONVOY, LLC - MD 242      
667-241 9 SLBRMDSBXVX  876D ONVOY, LLC - MD 242      
667-348 A SLBRMDSBXVX  876D ONVOY, LLC - MD 242      
667-348 2 SLBRMDSBXVX  876D ONVOY, LLC - MD 242      
667-348 3 SLBRMDSBXVX  876D ONVOY, LLC - MD 242      
667-348 4 SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242      
667-348 7 SLBRMD90BMD  516J TON80 COMMUNICATIONS, LLC 242      
667-348 8   318J COMCAST IP PHONE, LLC 242      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

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