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Confirming that your CNAME has been installed

In a Unix System:

You can check your CNAME status by using the Linux command dig cdn.yourdomain.com
You should see something similar to the example below:

cdn.yourdomain.com.    300    IN    CNAME   [CDN Resource ID].rsc.cdn77.org

In a Windows System:

Click on your Windows start button and type "cmd" in the box. A DOS window will open up. Type the command nslookup cdn.yourdomain.com

C:\Users\admin>nslookup cdn.yourdomain.com
Server:  UnKnown
Address:  192.168.10.2

Non-authoritative answer:
Name:   [CDN Resource ID].
rsc.cdn77.org
Address:  110.4.45.229
Aliases:  cdn.yourdomain.com