node-specification

    Supplies either the node name or the node address of the target
    node. If you supply the node name, the node address is obtained
    by looking up the node name in the LAN volatile node database. If
    you supply the node address, the corresponding node need not be
    defined in the LAN volatile node database. The address consists
    of 6 hexadecimal byte characters separated by hyphens or colons.