mail.krpservers.com has no NS records.
NS records for this zone are defined at krpservers.com.
NS records for this zone are defined at krpservers.com.
Question and response
Question
dig mail.krpservers.com. NS
Answer
The response has no answer records.
Authority
krpservers.com. 86400 SOA ns0.krpservers.com. root.krpservers.com. 2025101601 10800 3600 1600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0