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.

Modesto, CA

<< 1 2 3 4 5 6 7 8 9 10 11 12

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
350-230 9 SKTNCAGSGT0  6010 NEW CINGULAR WIRELESS PCS, LLC 738   2024-10-21   
559-766 A SKTNCA0127T  9740 PACIFIC BELL 738      

<< 1 2 3 4 5 6 7 8 9 10 11 12

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.