Prefix overview
Phone numbers in prefix 831-633
This page covers the 831-633 prefix in the United States. It shows where numbers come from, which carrier is linked to the range, and how this block is structured.
If you are looking for a specific number, you can continue to its dedicated phone page. Otherwise, this page helps you understand the broader number block behind it.
PREFIX
831-633
RATE CENTER
CASTROVL
CARRIER
PACIFIC BELL
CA
Prefix range
The prefix 831-633 includes numbers from 8316330000 to 8316339999.
This range is associated with the CASTROVL rate center and was originally assigned to PACIFIC BELL.
Numbers in this prefix
20 numbers