locating server IP of my ISP

I am connecting to internet through some ip provided by my mobile operator in range 100.xxx.xxx.xxx but when i surf on internet as some site directly gives me my ip address as 2xx.xxx.xxx.xxx? i want to ask then which is main server in mobile provider end. and how both class A and C are residing in same network.
i am newbie in LAN setups or i can say dont know how to configure web server with different class addresses. can anybody help to understand me this topology of my provider.Also can you tell me where is exactly web server should be? Is that possible to setup Network webserver with different class address.
pancoderAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Your provider probably has you going through a proxy server or a NAT device - both will alter the IP seen on the internet.
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