Third-level domain on a different server and hosting, with a different ip. Is it possible to customize?

Question

Domain Name System

Good day. Please help me with this question.
There are two virtual servers (vps) from different hosts. Both have a VestaCP control panel.
1. On the first server, the first hoster hosts a wordpess site on a virtual server in the format https://mysite.com. Everything is set up, everything works.
2. On the second server from the second hoster, I am going to host a phpBB forum of the format https://forum.mysite.com
Actually the main question, such a feint with the ears can generally be turned in order to place the domain of the third lvl on another server and even from another hoster, respectively, with a different ip. And if possible, how can this be done? As I understand it, you need to register something in the DNS server settings, I'm interested in what exactly? Within the framework of one server, I don’t experience any problems with the subdomain of the third lvl, but what should I do in this case?
Sincerely, thank you for your help.

Answer 1

If you have your own name servers, then I'm not sure.
But if someone (Google, Yandex, GoDaddy) manages DNS for you, then you just need to add an A or CNAME record to him.
My domain is registered with Google and there it is like this:
@ - this is the IP for my domain (second level) - slavikf.com
* - these are all subdomains (third level) - like any-many.slavikf.com
and then, IP for separate hosts, such as artur.slavikf.com, backup.slavikf.com, etc.
By the way, you can also use CNAME, not only A. CNAME is a type of forwarding for IP, but it's better to google for a more correct definition. In some cases, this is more convenient.

Answer 2

The scheme that works for me with 12 servers:
An "A" record for your subdomain would look like one of the following
Notice the dot at the end of the domain in the second case. I have seen both options on different DNS services and panels. Specifically for your Vesta, look online for a manual about working with DNS records, because. I have not come across this board.