Lots of times, like if you're at work, you don't have a modem. You just have a wire going into a wall. All the computers at businesses are usually connected together and they all share the same modem, which may be in a hall closet somewhere 10 floors below you. In that case, it may be quite a pain to go all the way down there to check it out, and you might not even have the authority to do so.
Some websites block pings as a effort to try to avoid being hacked into. Some years ago, there was actually something known as the "Ping of Death", which was a ping that would instantly crash someone's computer. It doesn't work anymore, but I guess some people are paranoid.
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Originally posted by LUVBUGZ
As far as seeing if a certain website is "up", would that be like you try to go to a site and that stupid, irritating "Page Cannot Be Found" thing comes up, so you "ping" the site to see if it's "up"?
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Exactly right. In that circumstance, you could then try to ping other websites. If you don't get responses from any of them, then chances are that you're not online. If all of these other sites give a response, then you are online, and the problem lies with the first site.