Note: Excluding IP addresses is only supported for Web/Display campaigns. Facebook campaigns do not support IP address exclusion.
The IP address exclusion setting is located in step one of your campaign setup form. When creating or editing a campaign, click the "Exclude IP Addresses" box:
Enter the IP address or addresses you wish to exclude, separated by a comma.
Complete the remaining campaign setup as normal, and save when you're done.
That's it! The IP addresses you entered will no longer be eligible to see the ads in this campaign.