Most modern modems do have such a feature to aid people with solving technical problems. For many modems, this is “192.168.100.1”. For others, this may differ so contact your ISP or research it in the owners manual that came with your specific modem. (e.g. Many Linksys modems listen at 192.168.1.1). You’ll need to enter that into your web browser’s address bar. If you’re not sure, look up your modem’s brand and model number followed by “diagnostics page” to find what address it should be located at. If your modem does not have a web page, you won’t be able to follow this article — contact your ISP for help with diagnosing your connection if you’re having issues.
If you have more than one Internet connection, to get this local IP address, make sure that you are connected to that particular connection before typing in the address into your browser.
For only some issues, even if your modem is connected to your computer, you can still check your server settings despite the inability to check any other page. However, a more complicated setup may require a visit from a technician.