How to do NSLOOKUP or DNS-resolution using HTTP-PROXY?

Question

I have an HTTP proxy URL which is working perfectly, now I wanna resolve some domain name's IP address using that particular proxy server. I'm not sure if that is even possible. Could somebody please point me in the right direction?

Use case: Actually, I know a domain which is giving output with that particular HTTP-PROXY but that domain is not even resolving when I try to open it on my computer directly. So I wanna to know to which particular IP that domain is resolving when queried through the HTTP-PROXY server

Answer 1

Using normal DNS this wouldn't be possible, but there is a recent standard for DNS over HTTPS that could nearly work for this.

I say nearly because the DNS resolution wouldn't actually happen on the proxy server, but you could use the proxy server to access one of the public DNS over HTTPS servers (e.g. 8.8.8.8 [https://dns.google.com/experimental] for Google or 1.1.1.1 [https://cloudflare-dns.com/dns-query] for Cloudflare, or you could run your own using my code https://www.hardill.me.uk/wordpress/2018/04/14/dns-over-https/)

e.g.

curl -H "Content-Type: application/dns-json" "https://dns.google.com/resolve?name=www.google.com&type=A"

gives an answer like:

{
  "Status": 0,
  "TC": false,
  "RD": true,
  "RA": true,
  "AD": false,
  "CD": false,
  "Question":[ 
    {
      "name": "www.google.com.",
      "type": 1
    }
  ],
  "Answer":[ 
    {
      "name": "www.google.com.",
      "type": 1,
      "TTL": 134,
      "data": "216.58.210.36"
    }
  ]
}

You would then configure curl (or what ever user agent) to use the proxy to make the request e.g.

export HTTPS_PROXY=http://proxy.server.com:8080
curl -H "Content-Type: application/dns-json" "https://dns.google.com/resolve?name=www.google.com&type=A"

Both Chrome and Firefox can be configured to do DNS resolution use DNS over HTTPS in the latest versions