There are several types of IP settings available for the Ebook Central platform. The following IP settings are visible in LibCentral under Settings>System.

Anonymous Access IPs
Access IPs 
Download IPs 
NOTE: IP ranges are limited to 18 bits. If you enter a range larger than 18 bits, you will receive the following error: "IP range not allowed. Please contact the Support Team for assistance."
If your institution's IP range is larger than 18 bits, please contact Ebook Support.