Prefix overview
Phone numbers in prefix 831-221
This page covers the 831-221 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
831-221
RATE CENTER
SAN ARDO
CARRIER
IP HORIZON LLC
CA
Prefix range
The prefix 831-221 includes numbers from 8312210000 to 8312219999.
This range is associated with the SAN ARDO rate center and was originally assigned to IP HORIZON LLC.
Numbers in this prefix
20 numbers