curl --request PUT \
  --url https://rdp.sh/api/v1/servers/{server}/rdns \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "rdns": "<string>"
}
'

{
  "status": true,
  "message": "<string>",
  "rdns": "<string>"
}