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 canonical form of
    the address consists of 6 hexadecimal byte characters separated
    by hyphens. Use a colon as the separator character to indicate
    the bit-reversed form of the address.