How can I check if a server is up in CS:GO?
I am trying to create a dedicated server. I can join but I want to know if it is available online for my friends. Is there any tool for this?
You can use http://www.canyouseeme.org/ . Just enter the port, 27015, and the website will try to connect to your server to see if the port is open or blocked by your ISP, forwarded (if you are behind a router) and accepting connections.
you should use
http://api.steampowered.com/ISteamApps/GetServersAtAddress/v0001?addr=<your ip here>&format=xml