What is ping? and what is it for?
A basic Internet program that lets you verify that a particular Internet address exists and can accept requests. The act of using the ping utility or command. Pinging is diagnostically used to ensure that a host computer, which you are trying to reach, actually operates.
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Please go to this link : http://www.robtex.com/dns/
Please go to http://www.kitterman.com/spf/validate.html