Prefix overview
Phone numbers in prefix 857-399
This page covers the 857-399 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
857-399
RATE CENTER
ROXBURY
CARRIER
BANDWIDTH.COM CLEC, LLC - MA
MA
Prefix range
The prefix 857-399 includes numbers from 8573990000 to 8573999999.
This range is associated with the ROXBURY rate center and was originally assigned to BANDWIDTH.COM CLEC, LLC - MA.
Numbers in this prefix
20 numbers