Prefix overview
Phone numbers in prefix 603-457
This page covers the 603-457 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
603-457
RATE CENTER
DOVER
CARRIER
IDT AMERICA, CORP. - NH
NH
Prefix range
The prefix 603-457 includes numbers from 6034570000 to 6034579999.
This range is associated with the DOVER rate center and was originally assigned to IDT AMERICA, CORP. - NH.
Numbers in this prefix
20 numbers