Start your MetaTrader 4 terminal.
Go to: [Files] -> [Open Data Folder] (or combination of left [ALT]+[F] keys and then [D] key).
New window should open. Go to [config] folder where will see SRV files that stores Brokers’s MT4 Server information.
Open [SRV file] with [Notepad] – on this step Windows will probably message you that it can’t open this type of file so you need to choose [Select a program from a list of installed programs] and there choose a [Notepad] program.
Now you need to look for DNS/IP address entry inside that file.