You can either block orders from a particular device rather than the IP address (since IP addresses can be bought and sold), or you can create a rule to add IPs to a blocklist.
To add the device ID to a blocklist, go to the Transaction Details page, click VIP Lists in the bottom left corner of the page, and then click Decline next to the Device ID:
To make a rule to blocklist certain IPs, create it as illustrated in the screen capture, and then add to the list whenever you have a new IP to blocklist. Save the rule, save the rule set, and then activate the rule set each time you add a new IP address or change the rules in any way, if you want your future orders to pass through the updated list of IPs: