Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Richmond, CA

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
510-974 7   649C ONVOY, LLC - CA 722   2014-11-27   
510-974 8   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2014-11-11   
510-974 9   6529 T-MOBILE USA, INC. 722   2014-11-11   
510-994 A SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722      
510-994 0   981E BANDWIDTH.COM CLEC, LLC - CA 722   2019-09-23   
510-994 1   6529 T-MOBILE USA, INC. 722   2020-08-05   
510-994 2   981E BANDWIDTH.COM CLEC, LLC - CA 722   2021-01-23   
510-994 3   624H ONVOY SPECTRUM, LLC 722   2021-03-02   
510-994 4   197D VONAGE AMERICA LLC 722   2020-06-15   
510-994 5   197D VONAGE AMERICA LLC 722   2020-06-15   
510-994 6   6529 T-MOBILE USA, INC. 722   2020-01-20   
510-994 7   6529 T-MOBILE USA, INC. 722   2020-01-20   
510-994 8   6529 T-MOBILE USA, INC. 722   2019-10-22   
510-994 9   6529 T-MOBILE USA, INC. 722   2019-10-22   

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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