domain name system - Create a subdomain for a internal server

I've a domain like domain.com and I've got a new requirements they give me a local server which is a web application and they asked me to create a sub domain that works internally for this server.

the local server is like : http://192.168.2.222/app/

The required sub domains is : http://app.domain.com

I've tried to add A and CNAME records on the dns for the sub domain but it didn't work. any suggestions to how accomplish this?

Answer

If app.domain.com is a domain name then you should create new zone depending which server you're using.

If app.domain.com is a host name then you just create A and PTR records in your zone.

Sure, you should have access to write the zone to accomplish this.