Next Available IP from Complex Search

[#1]

I am looking for a way of getting next available IP from a complex search.  I found a post that mentioned creating host record from a complex search, but was wondering if could be adapted for get getting the next IP, or how I would return the IP requested.  Here is the post body that I am using:

{
    "name": "host_record",
    "ipv4addrs": [
        {
            "ipv4addr": {
                "_object_function": "next_available_ip",
                "_object": "network",
                "_object_parameters": {
                    "*Application": "Automation",
                    "*Environment": "Development"
                },
                "_result_field": "ips",
                "_parameters": {
                    "num": 1
                }
            }
        }
    ]
}

[#2]

Response (so Don doesn't feel so lonely)