Reverse DNS Lookup for 123.252.121.17

Searching for 17.121.252.123.in-addr.arpa. PTR record at M.ROOT-SERVERS.NET. [202.12.27.33] ...took 14 ms
Searching for 17.121.252.123.in-addr.arpa. PTR record at b.in-addr-servers.arpa. [199.253.183.183] ...took 5 ms

Searching for rirns.arin.net. A record at M.ROOT-SERVERS.NET. [202.12.27.33] ...took 14 ms
Searching for rirns.arin.net. A record at b.gtld-servers.net. [192.33.14.30] ...took 30 ms
Searching for rirns.arin.net. A record at ns2.arin.net. [199.71.0.108] ...took 155 ms

Searching for 17.121.252.123.in-addr.arpa. PTR record at rirns.arin.net. [199.253.249.53] ...took 92 ms

Searching for dns6.kbtelecom.net.tw. A record at M.ROOT-SERVERS.NET. [202.12.27.33] ...took 15 ms
Searching for dns6.kbtelecom.net.tw. A record at e.dns.tw. [211.20.231.11] ...took 220 ms
Searching for dns6.kbtelecom.net.tw. A record at ns1.kbtelecom.net.tw. [61.63.0.66] ...took 319 ms

Searching for 17.121.252.123.in-addr.arpa. PTR record at dns6.kbtelecom.net.tw. [203.133.1.6] ...took 256 ms
SERVFAIL

Searching for dns8.kbtelecom.net.tw. A record at M.ROOT-SERVERS.NET. [202.12.27.33] ...took 15 ms
Searching for dns8.kbtelecom.net.tw. A record at d.dns.tw. [60.199.165.186] ...took 322 ms
Searching for dns8.kbtelecom.net.tw. A record at ns2.kbtelecom.net.tw. [61.63.0.67] ...took 301 ms

Searching for 17.121.252.123.in-addr.arpa. PTR record at dns8.kbtelecom.net.tw. [203.133.1.8] ...took 556 ms
SERVFAIL
Searching for 17.121.252.123.in-addr.arpa. PTR record at dns8.kbtelecom.net.tw. [203.133.1.8] ...took 674 ms
SERVFAIL
Searching for 17.121.252.123.in-addr.arpa. PTR record at dns6.kbtelecom.net.tw. [203.133.1.6] ...took 256 ms
SERVFAIL

None of the nameservers responded correctly.

Total elapsed query time: 3,244 ms