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: VINNVACBAMD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
771-255 5 Washington Zone 1 DC 515J IP HORIZON LLC 236   2026-04-16   
771-255 6 Washington Zone 1 DC 515J IP HORIZON LLC 236   2026-04-16   
826-244 2 Stafford VA 515J IP HORIZON LLC 236   2024-12-26   

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Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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