Searching for 147.20.223.221.in-addr.arpa. PTR record at I.ROOT-SERVERS.NET. [192.36.148.17]
...took 12 ms
Searching for 147.20.223.221.in-addr.arpa. PTR record at a.in-addr-servers.arpa. [199.180.182.53] ...took 152 ms
Searching for 147.20.223.221.in-addr.arpa. PTR record at a.in-addr-servers.arpa. [199.180.182.53] ...took 152 ms
Searching for apnic.authdns.ripe.net. A record at M.ROOT-SERVERS.NET. [202.12.27.33]
...took 14 ms
Searching for apnic.authdns.ripe.net. A record at j.gtld-servers.net. [192.48.79.30] ...took 25 ms
Searching for apnic.authdns.ripe.net. A record at manus.authdns.ripe.net. [193.0.9.7] ...took 12 ms
Searching for 147.20.223.221.in-addr.arpa. PTR record at apnic.authdns.ripe.net. [193.0.9.9]
...took 11 msSearching for apnic.authdns.ripe.net. A record at j.gtld-servers.net. [192.48.79.30] ...took 25 ms
Searching for apnic.authdns.ripe.net. A record at manus.authdns.ripe.net. [193.0.9.7] ...took 12 ms
Searching for ns.bta.net.cn. A record at D.ROOT-SERVERS.NET. [199.7.91.13]
...took 12 ms
Searching for ns.bta.net.cn. A record at d.dns.cn. [203.119.28.1] ...took 25 ms
SERVFAIL
Searching for ns.bta.net.cn. A record at ns.cernet.net. [202.112.0.44] ...took 191 ms
Searching for ns.bta.net.cn. A record at ddns.bta.net.cn. [202.106.196.233]
Searching for ns.bta.net.cn. A record at ns.bta.net.cn. [202.96.0.133] ...took 152 ms
Searching for 147.20.223.221.in-addr.arpa. PTR record at ns.bta.net.cn. [202.96.0.133]
...took 154 msSearching for ns.bta.net.cn. A record at d.dns.cn. [203.119.28.1] ...took 25 ms
SERVFAIL
Searching for ns.bta.net.cn. A record at ns.cernet.net. [202.112.0.44] ...took 191 ms
Searching for ns.bta.net.cn. A record at ddns.bta.net.cn. [202.106.196.233]
Query timed out (interrupted after 2,003 milliseconds)
Retrying...Searching for ns.bta.net.cn. A record at ns.bta.net.cn. [202.96.0.133] ...took 152 ms
Nameserver ns.bta.net.cn. reports: No such host 147.20.223.221.in-addr.arpa.
Total elapsed query time: 2,763 ms