How to get someone ip address
First there are many Methods :
If this person in you same network it will be easy thing to know his ip address you can use many applications to know his ip address as
1-Fing :
it is application make alot of things as it can make you Know who connect to your wifi and what's ip address of people who connected to wifi and can test ping of the internt and can test ping of any device you want and can make trace router and can make wake on lan and the best thing i love it it can saw the open ports of any ip address in same wifi for more information visit there site here
Download link for android :here
Download link for ios :here
Download link for computer :here
2-zANTI
This application is very amazing because it has alot of permissions Of course it make a device scanner and find open ports ,he also can open port 8080 in your ip address and show his logs
And it can change mac addres and the amazing things are it can make man in the middle attack
But this option need root for many information visit there site
Download link for android:here
3-Angry port scanner
The angry port scanner used to find ip address and ports very fast you can make start number and end number and can check open ports of ip
Download link for android : here
Download link for android :here
4-Nmap
This is tool used for many thing it is application complecate with [window , linx ,Kali linx , parrot ,mac ]
If you want to install it in Android you will install Termux to open it and use it
For more information there site :here