A simple DNS lookup tool
Domain 77.72.225.212
Type PTR
Server Quad9
Duration 173 ms
Results
JSON ZONE 
{
  "status": "NOERROR",
  "from": "9.9.9.9",
  "answer": [
    {
      "type": "PTR",
      "name": "s2.root-servers.org",
      "ttl": 7200
    }
  ]
}
This Lookup
Realtime Lookup