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: 650 [Rate centres in NPA 650] [Dial plan for NPA 650]

NXX: 372

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
650-372 A San Mateo CA SNMTCA11DS1  9740 PACIFIC BELL 722      
650-372 0 San Mateo CA SNMTCA11DS1  9740 PACIFIC BELL 722      
650-372 1 San Mateo CA SNMTCA11DS1  9740 PACIFIC BELL 722      
650-372 2 San Mateo CA SNMTCA11DS1  9740 PACIFIC BELL 722      
650-372 3 San Mateo CA SNMTCA11DS1  9740 PACIFIC BELL 722      
650-372 4 San Mateo CA SNMTCA11DS1  9740 PACIFIC BELL 722      
650-372 5 San Mateo CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2013-03-28   
650-372 6 San Mateo CA SNMTCA11DS1  9740 PACIFIC BELL 722      
650-372 7 San Mateo CA SNMTCA11DS1  9740 PACIFIC BELL 722      
650-372 8 San Mateo CA OKLDCAMPDS0  4733 PAETEC COMMUNICATIONS, INC. - CA 722   2013-03-13   
650-372 9 San Mateo CA SNMTCA11DS1  9740 PACIFIC BELL 722      

Last updated: Sun, 28 Feb 2021 19:06:05 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.