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

       /IP_ADDRESS=value
       /NOIP_ADDRESS

    Associates an IP address with the node name. Specify the address
    in the standard dotted notation, xxx.xxx.xxx.xxx.

    If you do not specify the /IP_ADDRESS=value qualifier, the
    setting remains unchanged. The /NOIP_ADDRESS qualifier clears
    the filed.