Prefix overview
Phone numbers in prefix 909-421
This page covers the 909-421 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
909-421
RATE CENTER
RIALTO
CARRIER
PACIFIC BELL
CA
Prefix range
The prefix 909-421 includes numbers from 9094210000 to 9094219999.
This range is associated with the RIALTO rate center and was originally assigned to PACIFIC BELL.
Numbers in this prefix
20 numbers