Blocking an IP Address without HTACCESS

[Kaemon]

I want to block any traffic coming from 119.63.196.x but I can't use an HTACCESS file because I'm on a Windows Server (we have an ASP.Net website).

To block the IP address, I want to run this PHP script on every page:

if(substr($_SERVER['REMOTE_ADDR'], 0, 10) == "119.63.196"){exit;}

To be honest, I haven't quite figured out how to write PHP code into the style template header yet. The layer of abstraction using IF CONDITION = is new to me and I haven't run across the tutorial or manual explaining it yet. ?????

Should I add this code to the global.php file? (I'm using vBulletin 3.7.4)

In case you were wondering, 119.63.196 are Baiduspider bots. Baidu is China's search engine (like Google) and they have dozens of spiders constantly indexing our site.