We have a system for coloring IP addresses based on the sender score. Requires reputation monitoring to be turned on for those IP addresses.

Color Definitions:
Black means there is no reputation monitoring/sender score for that IP.
Green = High sender score which is good 75 or higher
Yellow = Neutral sender score with 40 to 74
Red = Poor anything under 40.

It helps give an idea which IP's are the best to mail from.