Entering "port 138" on Google immediately gave me the following:
Port 138
Name:
netbios-dgm
Purpose:
NETBIOS Datagram Service
Description:
UDP NetBIOS datagrams packets are exchanged over this port, usually with
Windows machines but also with any other system running Samba (SMB).
These UDP NetBIOS datagrams support non-connection oriented file sharing
activities.
Related Ports:
137, 139, 445
Try it for yourself. It works and you will get plenty of information :-)
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