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.

Switch: BLTMMDCHXVX

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
443-755 4 Waterloo MD 321J HD CARRIER LLC 238   2016-05-14   
443-755 6 Waterloo MD 321J HD CARRIER LLC 238   2016-05-14   
443-755 7 Waterloo MD 321J HD CARRIER LLC 238   2016-05-14   
667-202 2 Elkton MD 321J HD CARRIER LLC 238   2016-05-14   
667-202 3 Elkton MD 321J HD CARRIER LLC 238   2016-05-14   
667-202 4 Elkton MD 321J HD CARRIER LLC 238   2016-05-14   
667-202 5 Elkton MD 321J HD CARRIER LLC 238   2016-05-14   
667-202 6 Elkton MD 321J HD CARRIER LLC 238   2016-05-14   
667-202 7 Elkton MD 321J HD CARRIER LLC 238   2016-05-14   
667-202 8 Elkton MD 321J HD CARRIER LLC 238   2016-05-14   
667-202 9 Elkton MD 321J HD CARRIER LLC 238   2016-05-14   
667-270 9 Annapolis MD 321J HD CARRIER LLC 238   2020-05-02   
667-399 A Union Bridge MD 321J HD CARRIER LLC 238      
667-399 8 Union Bridge MD 321J HD CARRIER LLC 238   2020-06-01   
667-399 9 Union Bridge MD 321J HD CARRIER LLC 238   2020-06-01   
667-600 7 Baltimore MD 321J HD CARRIER LLC 238   2020-05-02   
667-706 1 Elkton MD 321J HD CARRIER LLC 238   2016-09-05   
667-706 2 Elkton MD 321J HD CARRIER LLC 238   2016-09-05   
667-706 3 Elkton MD 321J HD CARRIER LLC 238   2016-09-05   
667-706 4 Elkton MD 321J HD CARRIER LLC 238   2016-09-05   
667-706 5 Elkton MD 321J HD CARRIER LLC 238   2016-09-05   
667-706 6 Elkton MD 321J HD CARRIER LLC 238   2016-09-05   
667-770 5 Baltimore MD 321J HD CARRIER LLC 238   2020-05-02   
667-776 A Baltimore MD 321J HD CARRIER LLC 238      
667-776 9 Baltimore MD 321J HD CARRIER LLC 238   2019-11-15   

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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