Prefix overview
Phone numbers in prefix 443-423
This page covers the 443-423 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
443-423
RATE CENTER
BALTIMORE
CARRIER
LEVEL 3 COMMUNICATIONS, LLC - MD
MD
Prefix range
The prefix 443-423 includes numbers from 4434230000 to 4434239999.
This range is associated with the BALTIMORE rate center and was originally assigned to LEVEL 3 COMMUNICATIONS, LLC - MD.
Numbers in this prefix
20 numbers