A school's information technology staff can use proxy detection services to determine if a proxy is being used on its network. This type of security practice can lead to the proxy being blocked from further access.
Proxy detection services can detect anonymous Internet protocol addresses that are either suspected or known to be associated with proxy services. When a user attempts to spoof his IP address to hide his location, the network he attaches to can detect the spoofed IP address and match it against lists or ranges of IP address that are commonly used for proxy services. The source of this spoofed IP address can be located using online IP lookup services, such as WhatIsMyIPAddress.com.