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.
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OCN: 553J WHITESKY COMMUNICATIONS, LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
831-432 2 Boulder Creek CA SNFCCA21XPZ  722   2021-09-16   
831-612 8 Aptos CA SNFCCA21XPZ  722   2021-09-16   
901-587 A Memphis TN MMPHTNMAYLX  468      
925-203 2 Pittsburg CA SNFCCA21XPZ  722   2021-09-16   
925-218 7 Pleasanton CA SNFCCA21XPZ  722   2021-09-16   
925-232 5 Pittsburg West CA SNFCCA21XPZ  722   2021-09-16   
925-235 3 Moraga CA SNFCCA21XPZ  722   2021-09-16   
925-257 5 Orinda CA SNFCCA21XPZ  722   2021-09-16   
925-297 3 Lafayette CA SNFCCA21XPZ  722   2021-09-16   
925-319 2 Sunol CA SNFCCA21XPZ  722   2021-09-16   
925-392 2 East Contra Costa CA SNFCCA21XPZ  722   2021-09-16   
925-498 0 Bishop Ranch CA SNFCCA21XPZ  722   2021-09-16   
925-524 1 Clayton CA SNFCCA21XPZ  722   2021-09-16   
925-599 3 Livermore CA SNFCCA21XPZ  722   2021-09-16   
925-644 9 Concord CA SNFCCA21XPZ  722   2021-09-16   
925-733 0 Danville CA SNFCCA21XPZ  722   2021-10-08   
925-891 2 Walnut Creek CA SNFCCA21XPZ  722   2021-09-16   
925-905 3 Dublin-San Ramon CA SNFCCA21XPZ  722   2021-09-11   
925-966 0 Antioch CA SNFCCA21XPZ  722   2021-09-16   

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Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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