A simple DNS lookup tool
Domain 174.40.251.142
Type PTR
Server Cloudflare
Duration 14 ms
Results
JSON ZONE 
{
  "status": "NOERROR",
  "from": "1.1.1.1",
  "answer": [
    {
      "type": "PTR",
      "name": "142.sub-174-40-251.myvzw.com",
      "ttl": 7200
    }
  ]
}
This Lookup
Realtime Lookup