convertions network b3d-bmax

I don't think that's douing what you think.
The return from getenv_("hostname") is null.
Try

Local ip_array:Int[]=HostIps("")
ip:Int = HostIp("") 

ipaddress$ = DottedIP$(ip) 

Print "Dotted IP Test" 
Print "==============" 
Print "Internal Host IP ID:" + ip 
Print "Dotted IP Address:" + ipaddress$ 
Print "" 
Print "Press any key to continue" 

WaitKey()