Prefix overview
Phone numbers in prefix 640-400
This page covers the 640-400 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
640-400
RATE CENTER
SEAIS CITY
CARRIER
ONVOY, LLC - NJ
NJ
Prefix range
The prefix 640-400 includes numbers from 6404000000 to 6404009999.
This range is associated with the SEAIS CITY rate center and was originally assigned to ONVOY, LLC - NJ.
Numbers in this prefix
20 numbers