How to reveal true IP address of the webpage?

"A" record of domain is not pointing to the same web-page. For example, "A" record of www.smtp.com domain points to 74.91.83.204, but once I put this IP in browser it direct me to http://ift.tt/2xod3Vb. The question is - how can I reveal the true IP where the data is hosted for webpage, for example www.smtp.com? Thank you very much in advance!!!