What sort of servers?
If the server would accept an HTTP request, you can do it using something like:
$fp = fsockopen("example.domain.com",80,&$errno,&$errstr,30);
if(!$fp):
echo "$errstr ($errno)<br>\n";
else:
fputs ($fp,$data);
fclose ($fp);
endif;
This will connect to a server on port 80 with a 30 second timeout. If a connection can't be made, it'll give you an error code and description on the page.
You could do this for each server.
