o7.ptr9643.cdkmessaging.com has no NS records.
NS records for this zone are defined at cdkmessaging.com.
NS records for this zone are defined at cdkmessaging.com.
Question and response
Question
dig o7.ptr9643.cdkmessaging.com. NS
Answer
The response has no answer records.
Authority
cdkmessaging.com. 900 SOA ns-1877.awsdns-42.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0