Prefix overview
Phone numbers in prefix 408-400
This page covers the 408-400 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
408-400
RATE CENTER
SUNNYVALE
CARRIER
PACIFIC BELL
CA
Prefix range
The prefix 408-400 includes numbers from 4084000000 to 4084009999.
This range is associated with the SUNNYVALE rate center and was originally assigned to PACIFIC BELL.
Numbers in this prefix
20 numbers