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.

NPA: 775 [Rate centres in NPA 775] [Dial plan for NPA 775]

NXX: 377

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
775-377 A Round Mountain NV RNMTNV12RS0  9742 NEVADA BELL 720      
775-377 0 Round Mountain NV   624H ONVOY SPECTRUM, LLC 720   2023-11-20   
775-377 1 Round Mountain NV   9742 NEVADA BELL 720      
775-377 2 Round Mountain NV   9742 NEVADA BELL 720      
775-377 3 Round Mountain NV   9742 NEVADA BELL 720      
775-377 4 Round Mountain NV   4805 LEVEL 3 COMMUNICATIONS, LLC - NV 720   2003-05-11   
775-377 6 Round Mountain NV   029F ONVOY, LLC - NV 720   2018-09-26   
775-377 7 Round Mountain NV   029F ONVOY, LLC - NV 720   2018-09-26   
775-377 9 Round Mountain NV   515J IP HORIZON LLC 720   2022-04-21   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.