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: HRFRCTCR3MD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
959-900 1 Hartford CT 318J COMCAST IP PHONE, LLC 920   2019-05-27   
959-936 4 Lyme CT 318J COMCAST IP PHONE, LLC 920   2022-08-13   
959-949 9 Jewett City CT 318J COMCAST IP PHONE, LLC 920   2023-05-08   
959-955 4 Killingworth CT 318J COMCAST IP PHONE, LLC 920   2022-06-15   

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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