Prefix overview
Phone numbers in prefix 231-221
This page covers the 231-221 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
231-221
RATE CENTER
HARBOR SPG
CARRIER
CENTURYLINK COMMUNICATIONS, LLC
MI
Prefix range
The prefix 231-221 includes numbers from 2312210000 to 2312219999.
This range is associated with the HARBOR SPG rate center and was originally assigned to CENTURYLINK COMMUNICATIONS, LLC.
Numbers in this prefix
20 numbers