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.

OCN: 612K CSC VOICE, LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
973-928 4 Passaic NJ   224   2006-07-29   
973-928 5 Passaic NJ   224   2006-07-29   
973-928 6 Passaic NJ   224   2007-06-22   
973-933 2 Mount Freedom NJ   224   2003-02-10   
973-949 3 Hawthorne NJ   224   2005-02-28   
973-949 4 Hawthorne NJ   224   2003-02-10   
973-949 5 Hawthorne NJ   224   2006-10-26   
973-955 0 Passaic NJ   224   2007-04-22   
973-955 2 Passaic NJ   224   2006-12-21   
973-955 4 Passaic NJ   224   2006-12-21   
973-957 0 Rockaway NJ   224   2014-09-06   
973-970 9 Succasunna NJ   224   2006-10-02   
973-987 3 Mountain View NJ   224   2017-09-22   
973-991 0 Newark NJ   224   2006-01-19   
973-991 1 Newark NJ   224   2006-02-19   
973-991 2 Newark NJ   224   2005-03-27   
973-991 3 Newark NJ   224   2005-03-27   
973-998 5 Morristown NJ   224      
973-998 6 Morristown NJ   224      
973-998 7 Morristown NJ   224      
973-998 8 Morristown NJ   224      

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Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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