Prefix overview
Phone numbers in prefix 443-307
This page covers the 443-307 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
443-307
RATE CENTER
BEL AIR
CARRIER
LEVEL 3 COMMUNICATIONS, LLC - MD
MD
Prefix range
The prefix 443-307 includes numbers from 4433070000 to 4433079999.
This range is associated with the BEL AIR rate center and was originally assigned to LEVEL 3 COMMUNICATIONS, LLC - MD.
Numbers in this prefix
20 numbers