Port 9100; Wsd Print - Konica Minolta Magicolor 1650EN Reference Manual

Port 9100

When printing through a network, TCP/IP port number 9100 can be used to
send raw data.

WSD print

Printing is possible using the WSD (Web Service on Devices) function
installed in Windows Vista. A connection supports WSD, detects the printer
on the network automatically and connects. Specifying a WSD printer when
printing from Windows Vista/Server 2008 allows printing using Web service
for communication.
Network Printing 6-13