A simple DNS lookup tool
Domain 216.239.38.21
Type PTR
Server Cloudflare
Duration 90 ms
Results
JSON ZONE 
{
  "status": "NOERROR",
  "from": "1.1.1.1",
  "answer": [
    {
      "type": "PTR",
      "name": "any-in-2615.1e100.net",
      "ttl": 86400
    }
  ]
}
This Lookup
Realtime Lookup