Searching for 28.51.234.121.in-addr.arpa. PTR record at B.ROOT-SERVERS.NET. [192.228.79.201]
...took 19 ms
Searching for 28.51.234.121.in-addr.arpa. PTR record at f.in-addr-servers.arpa. [193.0.9.1] ...took 12 ms
Searching for 28.51.234.121.in-addr.arpa. PTR record at ns.jsinfo.net. [221.228.255.2] ...took 243 ms
Searching for 28.51.234.121.in-addr.arpa. PTR record at f.in-addr-servers.arpa. [193.0.9.1] ...took 12 ms
Searching for rirns.arin.net. A record at B.ROOT-SERVERS.NET. [192.228.79.201]
...took 69 ms
Searching for rirns.arin.net. A record at g.gtld-servers.net. [192.42.93.30] ...took 6 ms
Searching for rirns.arin.net. A record at ns3.arin.net. [199.5.26.108] ...took 155 ms
Searching for 28.51.234.121.in-addr.arpa. PTR record at rirns.arin.net. [199.253.249.53]
...took 156 msSearching for rirns.arin.net. A record at g.gtld-servers.net. [192.42.93.30] ...took 6 ms
Searching for rirns.arin.net. A record at ns3.arin.net. [199.5.26.108] ...took 155 ms
Searching for ns.ptt.js.cn. A record at B.ROOT-SERVERS.NET. [192.228.79.201]
...took 25 ms
Searching for ns.ptt.js.cn. A record at e.dns.cn. [203.119.29.1] ...took 22 ms
Searching for ns.ptt.js.cn. A record at ns.ptt.js.cn. [218.2.135.2] ...took 232 ms
Searching for 28.51.234.121.in-addr.arpa. PTR record at ns.ptt.js.cn. [218.2.135.2]
Searching for ns.ptt.js.cn. A record at e.dns.cn. [203.119.29.1] ...took 22 ms
Searching for ns.ptt.js.cn. A record at ns.ptt.js.cn. [218.2.135.2] ...took 232 ms
Query timed out (interrupted after 2,002 milliseconds)
Retrying...Searching for 28.51.234.121.in-addr.arpa. PTR record at ns.jsinfo.net. [221.228.255.2] ...took 243 ms
Nameserver ns.jsinfo.net. reports: No such host 28.51.234.121.in-addr.arpa.
Total elapsed query time: 2,941 ms