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: 541 [Rate centres in NPA 541] [Dial plan for NPA 541]

NXX: 920

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
541-920 A Vale OR BOISIDMAXTX  7442 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OR 652      
541-920 0 Vale OR   750E ONVOY, LLC - OR 652   2016-04-11   
541-920 1 Vale OR   750E ONVOY, LLC - OR 652   2016-04-11   
541-920 2 Vale OR   073H TELNYX LLC 652   2018-10-12   
541-920 3 Vale OR   750E ONVOY, LLC - OR 652   2021-04-26   
541-920 4 Vale OR   624H ONVOY SPECTRUM, LLC 652   2021-07-18   
541-920 5 Vale OR   750E ONVOY, LLC - OR 652   2022-09-05   
541-920 6 Vale OR   624H ONVOY SPECTRUM, LLC 652   2021-09-26   
541-920 7 Vale OR   624H ONVOY SPECTRUM, LLC 652   2021-11-21   
541-920 8 Vale OR   624H ONVOY SPECTRUM, LLC 652   2021-11-21   
541-920 9 Vale OR   7442 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OR 652   2014-03-05   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.