I used 208.2.25*.6:80 and when I check if it was anonymous from allnettools I got this.

Proxy server not detected

Remote address 208.2.25*.6 (cache*000.cacheflow.com)
Remote host 208.2.25*.6 (cache*000.cacheflow.com)

I don't see my IP so I think it is anonymous but just wanted to ask to make sure

Thanks