Searching for 20.130.121.42.in-addr.arpa. PTR record at I.ROOT-SERVERS.NET. [192.36.148.17]
...took 11 ms
Searching for 20.130.121.42.in-addr.arpa. PTR record at b.in-addr-servers.arpa. [199.253.183.183] ...took 14 ms
Searching for 20.130.121.42.in-addr.arpa. PTR record at b.in-addr-servers.arpa. [199.253.183.183] ...took 14 ms
Searching for ns2.apnic.net. A record at I.ROOT-SERVERS.NET. [192.36.148.17]
...took 12 ms
Searching for ns2.apnic.net. A record at f.gtld-servers.net. [192.35.51.30] ...took 6 ms
Searching for ns2.apnic.net. A record at ns4.apnic.net. [202.12.31.53] ...took 16 ms
Searching for 20.130.121.42.in-addr.arpa. PTR record at ns2.apnic.net. [203.119.95.53]
...took 6 msSearching for ns2.apnic.net. A record at f.gtld-servers.net. [192.35.51.30] ...took 6 ms
Searching for ns2.apnic.net. A record at ns4.apnic.net. [202.12.31.53] ...took 16 ms
Searching for ns5.aliyun.com. A record at B.ROOT-SERVERS.NET. [192.228.79.201]
...took 25 ms
Searching for ns5.aliyun.com. A record at c.gtld-servers.net. [192.26.92.30] ...took 25 ms
Searching for ns5.aliyun.com. A record at ns5.aliyun.com. [47.88.74.34] ...took 156 ms
Searching for 20.130.121.42.in-addr.arpa. PTR record at ns5.aliyun.com. [140.205.122.153]
...took 39 msSearching for ns5.aliyun.com. A record at c.gtld-servers.net. [192.26.92.30] ...took 25 ms
Searching for ns5.aliyun.com. A record at ns5.aliyun.com. [47.88.74.34] ...took 156 ms
Nameserver ns5.aliyun.com. reports: No such host 20.130.121.42.in-addr.arpa.
Total elapsed query time: 310 ms