Use the nova baremetal-node-list command to view all bare-metal nodes and interfaces. When a node is in use, its status includes the UUID of the instance that runs on it:
$ nova baremetal-node-list +----+--------+------+-----------+---------+-------------------+------+------------+-------------+-------------+---------------+ | ID | Host | CPUs | Memory_MB | Disk_GB | MAC Address | VLAN | PM Address | PM Username | PM Password | Terminal Port | +----+--------+------+-----------+---------+-------------------+------+------------+-------------+-------------+---------------+ | 1 | ubuntu | 1 | 512 | 10 | aa:bb:cc:dd:ee:ff | None | 1.2.3.4 | ipmi | | None | +----+--------+------+-----------+---------+-------------------+------+------------+-------------+-------------+---------------+
