The demo is for "Anonymus" user so IP tracking is not showed.
"The Visitor IP (visitIp field) and the Unique Visitor ID (visitorId field) will be displayed in the user interface and returned in the API output only if you are logged in Piwik. For privacy reasons, we do not display the IP or Visitor ID to anonymous users."
REF: [piwik.org]
But for Piwik users with View or Admin status, you will see IPs.
Dali
"The Visitor IP (visitIp field) and the Unique Visitor ID (visitorId field) will be displayed in the user interface and returned in the API output only if you are logged in Piwik. For privacy reasons, we do not display the IP or Visitor ID to anonymous users."
REF: [piwik.org]
But for Piwik users with View or Admin status, you will see IPs.
Dali