_spf.melbicom.net has no NS records.
NS records for this zone are defined at melbicom.net.
NS records for this zone are defined at melbicom.net.
Question and response
Question
dig _spf.melbicom.net. NS
Answer
The response has no answer records.
Authority
melbicom.net. 300 SOA dns1.swiftycdn.net. ncc.melbicom.net. 2012123333 7200 2400 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0