Prefix overview
Phone numbers in prefix 840-666
This page covers the 840-666 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
840-666
RATE CENTER
FONTANA
CARRIER
FRACTEL, LLC
CA
Prefix range
The prefix 840-666 includes numbers from 8406660000 to 8406669999.
This range is associated with the FONTANA rate center and was originally assigned to FRACTEL, LLC.
Numbers in this prefix
20 numbers