VMS Help LANCP, SET, NODE, Qualifiers, /DECNET_ADDRESS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /DECNET_ADDRESS=value
       /NODECNET_ADDRESS

    Associates a DECnet address with the node name. Specify the
    address in DECnet notation, xx.xxxx.

    If you do not specify the /DECNET_ADDRESS=value qualifier, then
    the setting remains unchanged. The /NODECNET_ADDRESS qualifier
    clears the field.