nova/nova/tests/integrated/v3/api_samples/server-ips/server-ips-resp.json.tpl

{
    "addresses": {
        "private": [
            {
                "addr": "%(ip)s",
                "OS-EXT-IPS-MAC:mac_addr": "aa:bb:cc:dd:ee:ff",
                "OS-EXT-IPS:type": "fixed",
                "version": 4
            }
        ]
    }
}