Searching for 121.52.137.125.in-addr.arpa. PTR record at D.ROOT-SERVERS.NET. [199.7.91.13]
...took 11 ms
Searching for 121.52.137.125.in-addr.arpa. PTR record at a.in-addr-servers.arpa. [199.180.182.53] ...took 158 ms
Searching for 121.52.137.125.in-addr.arpa. PTR record at a.in-addr-servers.arpa. [199.180.182.53] ...took 158 ms
Searching for ns2.apnic.net. A record at D.ROOT-SERVERS.NET. [199.7.91.13]
...took 11 ms
Searching for ns2.apnic.net. A record at d.gtld-servers.net. [192.31.80.30] ...took 25 ms
Searching for ns2.apnic.net. A record at ns4.apnic.net. [202.12.31.53] ...took 16 ms
Searching for 121.52.137.125.in-addr.arpa. PTR record at ns2.apnic.net. [203.119.95.53]
...took 5 msSearching for ns2.apnic.net. A record at d.gtld-servers.net. [192.31.80.30] ...took 25 ms
Searching for ns2.apnic.net. A record at ns4.apnic.net. [202.12.31.53] ...took 16 ms
Searching for b.dns.kr. A record at M.ROOT-SERVERS.NET. [202.12.27.33]
...took 14 ms
Searching for b.dns.kr. A record at f.dns.kr. [210.101.62.1] ...took 339 ms
Searching for 121.52.137.125.in-addr.arpa. PTR record at b.dns.kr. [210.101.60.1]
...took 288 msSearching for b.dns.kr. A record at f.dns.kr. [210.101.62.1] ...took 339 ms
Searching for rev1.kornet.net. A record at I.ROOT-SERVERS.NET. [192.36.148.17]
...took 11 ms
Searching for rev1.kornet.net. A record at f.gtld-servers.net. [192.35.51.30] ...took 6 ms
Searching for rev1.kornet.net. A record at ns2.kornet.net. [211.216.50.160] ...took 278 ms
Searching for 121.52.137.125.in-addr.arpa. PTR record at rev1.kornet.net. [211.216.50.170]
...took 278 msSearching for rev1.kornet.net. A record at f.gtld-servers.net. [192.35.51.30] ...took 6 ms
Searching for rev1.kornet.net. A record at ns2.kornet.net. [211.216.50.160] ...took 278 ms
Nameserver rev1.kornet.net. reports: No such host 121.52.137.125.in-addr.arpa.
Total elapsed query time: 1,440 ms