V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

IPX
       Internet Packet eXchange (Novell, Netware)


The Free On-line Dictionary of Computing (30 December 2018):

Internetwork Packet eXchange
IPX

    (IPX) A network layer protocol initially
   developed at XEROX Corporation and made popular by Novell,
   Inc. as the basic protocol in its Novell NetWare file
   server operating system.

   A router with IPX routing can interconnect Local Area
   Networks so that Netware clients and servers can
   communicate.

   The SPX transport layer protocol runs on top of IPX.

   (1997-03-04)