Hi Klipp,
Can you open the printer settings in your web browser? Try
http://192.168.1.140 and you should be presented with with three tabs, status, settings and networking. Look for host name on the networking page, should be something like NPI8132B6.
(Just noticed that my slpr setup shows NP18132B6, third character '1' instead of 'I' which is listed by the printer. Possibly an error from my side but if so that indicates that you can fill in what you like (?).)
You can also find it this way:
Press the OK button to bring up the menu.
"Reports" will be displayed -- press the OK button.
Scroll to the right until "Config Report" is displayed.
Press the OK button to print out the configuration page.
Per