Issue reverse DNS lookup shows wrong domain

[pfrenn]

when I do nslookup on our server it shows the wrong server domain name.
It shows an old domain name but we changed in March 2020 to a new domain name but it is not reflected (Ok, to be honest, I found the error yesterday and changed server names in all host files and in PLESK but still the wrong server name is shown on the reverse DNS nslookup.

 

[IgorG]

Contact hosting provider or ISP to change PTR record of the IP address.
This record may only be modified by the IP address owner.

The PTR record must have a full chain and may point to server's hostname, or to one of the server's domains:

# host 203.0.113.2
2.113.0.203 in-addr.arpa domain name pointer 203-0-113-2.example.com

# host 203-0-113-2.example.com
203-0-113-2.example.com 203.0.113.2