ip4-spf.hkbnes.net has no NS records.
NS records for this zone are defined at hkbnes.net.
NS records for this zone are defined at hkbnes.net.
Question and response
Question
dig ip4-spf.hkbnes.net. NS
Answer
The response has no answer records.
Authority
hkbnes.net. 300 SOA a1-138.akam.net. sysadm.ns1.hkbn.net. 2211020498 1800 1800 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0