Change IP to domain name

Goodafternoon everyone,
I recently migrated a website to a new server but unfortunately it had all static links to the previous webserver for the images. So when the website on the old server is taken ofline nothing would work anymore. I found a way to deal with this. However, there is 1 enoying static link that I can’t change.

I searched my sql database for the ip address and also my ftp uploads but I can’t find the static IP address which is being displayed when I hover over my mouse on a picture.

It says for example that the link will go to https://www.domain.com/like and the image that is being displayed is on 123.12.123.1/images/image.jpg

I want to change the ip address to the domain name but as I said before, am unable to locate where it is written.

I think it is in the theme as it is the frame of all my pages.
Does someone know of a start of how to change the theme so I can change the ip address to the domain name?

Summary:
– it is not in the database ( for sure )
– it is not in the FTP location ( or it is encrypted which I doubt ).
– It is displayed in all my pages ( it is not a sidebar I think )

I know it is not much of information but hopefully someone could tell me to look somewhere else. A location besides the ftp and sql database.