Hello dear,

If you want to purchase domain directly without purchase domain then it is possible for you.

If you want to do like this then please follow below given syntex.

https://108.170.52.42/~usernameofcpanel/

First will be ip then /~ then type username.

Then you can use your hosting username with IP for show your any website.

In case of any issue or question, you can reply to the comment.