[HushPuppies]

For begginers
Go to command prompt-Start-Run-cmd
than type nslookup
and enter a website name
Or you type tracert and the website link

[coretxx]

for beginners:
http://whois.domaintools.com/

not?

[The Alchemist]

Another way : go to command prompt, type ping <website> and press enter
Example : ping www.something.com

But, to get the IP addresses of Cloudfare protected sites(like Hackcommunity itself), this way, or your way won't work... You need a cloudfare resolver...