I read the question How can I find the IP address for my visitors in Google Analytics Universal reports?, but wasn't sure if it applies to sites.google.com
1 Answer
I don't believe you can see IP addresses of your visitors. You also cannot collect this information, as it goes against Google's policy of collecting personally identifiable information (https://support.google.com/analytics/answer/2795983?hl=en).
Edit: I should clarify that although I haven't found anywhere where it says explicitly that sites.google.com doesn't allow for the collection of IP address, I am merely extending Google's policy to those sites as well, afterall, why whould Google not allow PII collection through their Analytics on all non-Google sites, but yet allow it for theirs (sites.google.com)?