Prefix overview
Phone numbers in prefix 857-504
This page covers the 857-504 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
857-504
RATE CENTER
BOSTON
CARRIER
LEVEL 3 COMMUNICATIONS, LLC - MA
MA
Prefix range
The prefix 857-504 includes numbers from 8575040000 to 8575049999.
This range is associated with the BOSTON rate center and was originally assigned to LEVEL 3 COMMUNICATIONS, LLC - MA.
Numbers in this prefix
20 numbers