nova/doc/v3/api_samples/server-ips/server-ips-resp.json

{
    "addresses": {
        "private": [
            {
                "addr": "192.168.0.3",
                "mac_addr": "aa:bb:cc:dd:ee:ff",
                "type": "fixed",
                "version": 4
            }
        ]
    }
}