Trusted IP ranges in Salesforce block unauthorized access as there are no location restrictions with the platform’s default settings. After specifying a Trusted IP range, only authorized Perimeter 81 users from your Private Server will have access to Salesforce resources.
Setup in SalesForce
Navigate to the Setup section of Salesforce and in the Quick Find search box type "Network Access".
Click on New and the fill in the Perimeter 81 Private Server IP address, entering both the start and end of the IP range and add a description. Click save.