Prefix overview
Phone numbers in prefix 667-421
This page covers the 667-421 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
667-421
RATE CENTER
COLUMBIA
CARRIER
TELNYX LLC
MD
Prefix range
The prefix 667-421 includes numbers from 6674210000 to 6674219999.
This range is associated with the COLUMBIA rate center and was originally assigned to TELNYX LLC.
Numbers in this prefix
20 numbers