Prefix overview
Phone numbers in prefix 443-300
This page covers the 443-300 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
443-300
RATE CENTER
SYKESVILLE
CARRIER
LEVEL 3 COMMUNICATIONS, LLC - MD
MD
Prefix range
The prefix 443-300 includes numbers from 4433000000 to 4433009999.
This range is associated with the SYKESVILLE rate center and was originally assigned to LEVEL 3 COMMUNICATIONS, LLC - MD.
Numbers in this prefix
20 numbers