Prefix overview
Phone numbers in prefix 603-400
This page covers the 603-400 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
603-400
RATE CENTER
HOLLIS
CARRIER
CHARTER IP ENABLED SERVICES, LLC
NH
Prefix range
The prefix 603-400 includes numbers from 6034000000 to 6034009999.
This range is associated with the HOLLIS rate center and was originally assigned to CHARTER IP ENABLED SERVICES, LLC.
Numbers in this prefix
20 numbers