ping xyz.com is not working but ping www.xyz.com is working [closed]

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Some one please help me in this

when I do ping xyz.com it is showing as host not reachable...

funky@li300-250:/etc/apache2$ ping xyz.com ping: unknown host xyz.com funky@li300-250:/etc/apache2$

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Actually xyz.com can be not the same host as www.xyz.com and it can deny ICMP requests