I think you'll want to change the errmode to be return. By default, the errmode is set to die.
Basically, change you connection line to be something like:
$telnet = Net::Telnet->new(Host =>"$x",timeout=>13,errmode=>return);
Then you'll need to check $telnet to determine if it was able to successfully connect or not. Check the documentation of Net::Telnet for more details on this.
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