1. Go to IIS Manager, start menu > run > type “inetmgr” >
2. Expand WebSite Folder, and Right Click Default Web Site ( your web site )
3. Open tab Directory Security and Click Edit at IP Address and IP Restriction
4. Set your Option Grandted or Denied access. If you fill and type IP in granted access, so Only listed IP can access in your IIS/Web Server.