here is what GRC's "port authority" says about port 138:
https://www.grc.com/port_138.htmyou can access GRC's "port authority" from GRC's "shields up" webpage, where it says "look up specific port information".. here is the link for "GRC":
https://www.grc.com/default.htmi disable "netbios" in my "network settings".. those ports are normally used for "netbios"..
if you want more information about "port 138", you could do a google-search, searching for "port 138"..