Because thousands of users shared the same Opera Mini proxy IP addresses, websites often got confused. Imagine a website seeing thousands of login requests coming from a single IP address (the proxy). It looks suspicious.

Opera does not officially publish a static list of IP addresses because they change frequently to manage global traffic load. However, traffic from Opera Mini typically originates from several known IP ranges owned by . Commonly identified Opera Mini proxy IP ranges include: 82.145.208.0/20 (e.g., 82.145.210.197, 82.145.222.234) 37.228.104.0/21 107.167.96.0/19 141.0.8.0/21 185.26.180.0/22

"I’m sorry, you have been blocked," the website would say.

: By reducing the payload size, pages load faster on 2G, 3G, or congested Wi-Fi networks.

Or, a user in Brazil might be routed through a proxy server in the US. Google would see the US IP address and present the homepage in English, confusing the user. "Why does Google think I'm in America?" was a common question, answered simply: "The Opera Proxy says you are."