while :

date >> diganswer.txt

dig +noall +answer soa @ns1.linode.com grantsolutionsusa.com >> diganswer.txt

dig +noall +answer soa @ns2.linode.com grantsolutionsusa.com >> diganswer.txt

dig +noall +answer soa @ns3.linode.com grantsolutionsusa.com >> diganswer.txt

dig +noall +answer soa @ns4.linode.com grantsolutionsusa.com >> diganswer.txt

dig +noall +answer soa @ns5.linode.com grantsolutionsusa.com >> diganswer.txt

sleep 900