Why my public ip address is different when I visit different website? [closed]

Posted by Mett Li on Pro Webmasters See other posts from Pro Webmasters or by Mett Li
Published on 2012-09-18T10:56:50Z Indexed on 2012/09/18 15:54 UTC
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php

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ip-address

After I connect to web via pppoe, I visit different website's phpinfo() page, but the result of _SERVER["REMOTE_PORT"] is different.

Including some ip address lookup site like www.whatismyip.com, www.apnic.net etc. and gmail's ip location lookup list are all different. Why?

Is these different ip address allocated by ISP on different web resources ?

Maybe the reason is CDN by my ISP or the website? If the reason is the ip address allocated by ISP on different web resources, the website visitor's ip address may unreal.

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