To exclude all traffic from a given IP or IP range, log in Piwik as the Super User. Click on Settings > Websites. Below the list of websites, you will find the option to specify “Global list of Excluded IPs”. You can define a given IP address, or IP ranges (
143.2.*.* for example) to be excluded from being tracked on all websites. Each Piwik admin user can also specify the list of IPs or IP ranges to exclude for specific websites.