I am doing an online course on web penetration testing where the instructor tells us to install Kali Linux on one virtual machine (the attacker), and any other OS (I chose Manjaro Linux) on another virtual machine as the victim machine.
At this point he takes us to the Kali Machine and types in the browser some.arbitrary.ip.adress/dvwa and voila, he is on the log on page of his dvwa hosted from the other machine. He just says that this i.p address will depend on the environment that you have but doesn't explain how he actually found it. (Then I think he uses Burp with that same address).
I tried googling to find out what my IP address is but when I tried to do what he did using my IP address it sent me to my router's page.
How do I find out what the IP address is for my victim machine so that I can type it into the URL on my attacker machine?