I have checked my domain in http://ipinfo.info/html/ip_checker.phpIt is showing the website is having two IPs (Aliasis) like 54.xx.xx.xx & 103.xx.xx.xx. Checked few popular websites and noticed not many websites are having more than one IP.Those IPs are not being redirected to website too. Does this affect speed/performance or SEO of the website? 
Does domain aliasing affect performance or SEO?
dns;performance;ip address;dns lookup
No, it does not affect in SEO. Google own IP is changing from time to time also with location. It is mainly because of load balancing. Many of website using cloud based hosting, and their bucket location is various based on user location. Choosing best bucket region can help developer to save money, because ingress and egress traffic are depend on cloud server location. Also when same region bucket cached by CDN then rate are different. So there are some valid reason to use different bucket region (And so one multiple IP address) to host website.And if you're using IP checker tools, then you should note that, they are returning their server IP address based on location. So if you try to ping same website from other location then server IP may be different, so don't focus on third party tools, because their location is fixed.