Prefix overview
Phone numbers in prefix 857-400
This page covers the 857-400 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
857-400
RATE CENTER
BOSTON
CARRIER
BANDWIDTH.COM CLEC, LLC - MA
MA
Prefix range
The prefix 857-400 includes numbers from 8574000000 to 8574009999.
This range is associated with the BOSTON rate center and was originally assigned to BANDWIDTH.COM CLEC, LLC - MA.
Numbers in this prefix
20 numbers