An IPX address looks like 11223344:5566778899AA:BBCC (network, node, socket) where the numbers are in hexadecimal. X.type is IPX, X.a is 0x11 (0x indicates hex), X.b is 0x22, X.c is 0x33, X.d is 0x44, X.e is 0x55, X.f is 0x66, X.g is 0x77, X.h is 0x88, X.i is 0x99, X.j is 0xAA, X.k is 0xBB, and X.l is 0xCC.
X is a variable of type NETADDRESS.