spf.plugcrm.net has no NS records.
NS records for this zone are defined at plugcrm.net.
NS records for this zone are defined at plugcrm.net.
Question and response
Question
dig spf.plugcrm.net. NS
Answer
The response has no answer records.
Authority
plugcrm.net. 900 SOA ns-227.awsdns-28.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0