Companies often use centralized proxy servers to control Internet traffic, block unwanted websites, control bandwidth settings and cache popular websites for faster browsing. To find a proxy server address, use the browser's proxy server settings window. How you access this window depends on which browser you use.
Click the "Tools" menu in Internet Explorer, and select "Internet Options" to open the browser properties. Click the "Connections" tab and select "Settings" to open the proxy server configuration. View the section labeled "Proxy Server." This contains the Internet protocol and port address for your proxy server.
Click the "Firefox" menu, select "Options" and choose "Options" again from the context menu. Click the "Advanced" tab, and then select the "Network" tab. Click "Settings" to open your proxy server configurations. View the section labeled "Manual Proxy Configurations." This lists the IP and port addresses of your proxy server.
Click the "Chrome" menu button with the three horizontal lines on the Chrome browser toolbar. Click "Settings" in the drop-down menu. Scroll to the bottom of the page and click the "Show Advanced Settings" button. Scroll to the Network section of the expanded page. This states what proxy, if any, is being used to connect to the network. Click the "Change Proxy Settings" to see the IP port and address or to change the proxy settings.