Prefix overview
Phone numbers in prefix 831-307
This page covers the 831-307 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
831-307
RATE CENTER
CASTROVL
CARRIER
LEVEL 3 COMMUNICATIONS, LLC - CA
CA
Prefix range
The prefix 831-307 includes numbers from 8313070000 to 8313079999.
This range is associated with the CASTROVL rate center and was originally assigned to LEVEL 3 COMMUNICATIONS, LLC - CA.
Numbers in this prefix
20 numbers