Prefix overview
Phone numbers in prefix 603-343
This page covers the 603-343 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
603-343
RATE CENTER
DOVER
CARRIER
COMCAST IP PHONE, LLC
NH
Prefix range
The prefix 603-343 includes numbers from 6033430000 to 6033439999.
This range is associated with the DOVER rate center and was originally assigned to COMCAST IP PHONE, LLC.
Numbers in this prefix
20 numbers