Prefix overview
Phone numbers in prefix 623-738
This page covers the 623-738 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
623-738
RATE CENTER
PHOENIX
CARRIER
LEVEL 3 COMMUNICATIONS, LLC - AZ
AZ
Prefix range
The prefix 623-738 includes numbers from 6237380000 to 6237389999.
This range is associated with the PHOENIX rate center and was originally assigned to LEVEL 3 COMMUNICATIONS, LLC - AZ.
Numbers in this prefix
20 numbers