A simple DNS lookup tool
Domain 198.41.0.4
Type PTR
Server Cloudflare
Duration 3 ms
Results
JSON ZONE 
{
  "status": "NOERROR",
  "from": "1.1.1.1",
  "answer": [
    {
      "type": "PTR",
      "name": "a.root-servers.net",
      "ttl": 156
    }
  ]
}
This Lookup
Realtime Lookup