Searching for 4.160.31.81.in-addr.arpa. PTR record at M.ROOT-SERVERS.NET. [202.12.27.33]
...took 15 ms
Searching for 4.160.31.81.in-addr.arpa. PTR record at d.in-addr-servers.arpa. [200.10.60.53] ...took 118 ms
Searching for 4.160.31.81.in-addr.arpa. PTR record at d.in-addr-servers.arpa. [200.10.60.53] ...took 118 ms
Searching for ns3.lacnic.net. A record at M.ROOT-SERVERS.NET. [202.12.27.33]
...took 14 ms
Searching for ns3.lacnic.net. A record at k.gtld-servers.net. [192.52.178.30] ...took 12 ms
Searching for ns3.lacnic.net. A record at ns4.lacnic.net. [190.112.52.35] ...took 170 ms
Searching for 4.160.31.81.in-addr.arpa. PTR record at ns3.lacnic.net. [200.3.13.14]
...took 196 msSearching for ns3.lacnic.net. A record at k.gtld-servers.net. [192.52.178.30] ...took 12 ms
Searching for ns3.lacnic.net. A record at ns4.lacnic.net. [190.112.52.35] ...took 170 ms
Searching for ns2.sharif.edu. A record at M.ROOT-SERVERS.NET. [202.12.27.33]
...took 15 ms
Searching for ns2.sharif.edu. A record at j.edu-servers.net. [192.48.79.30] ...took 13 ms
Searching for ns2.sharif.edu. A record at ns1.sharif.edu. [81.31.160.34] ...took 94 ms
Searching for 4.160.31.81.in-addr.arpa. PTR record at ns2.sharif.edu. [81.31.160.35]
...took 92 msSearching for ns2.sharif.edu. A record at j.edu-servers.net. [192.48.79.30] ...took 13 ms
Searching for ns2.sharif.edu. A record at ns1.sharif.edu. [81.31.160.34] ...took 94 ms
Nameserver ns2.sharif.edu. reports: No such host 4.160.31.81.in-addr.arpa.
Total elapsed query time: 739 ms