ns-b.ktk.io.
Question and response
Question
dig 203.200-207.198.231.5.in-addr.arpa. PTR
Answer
203.200-207.198.231.5.in-addr.arpa. 86400 PTR ns-b.ktk.io.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0