spf.gonetcore.com has no NS records.
NS records for this zone are defined at gonetcore.com.
NS records for this zone are defined at gonetcore.com.
Question and response
Question
dig spf.gonetcore.com. NS
Answer
The response has no answer records.
Authority
gonetcore.com. 3600 SOA a.root-servers.net. teamde\@netcore.co.in. 648758928 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0