_spf.itoolabs.net has no NS records.
NS records for this zone are defined at itoolabs.net.
NS records for this zone are defined at itoolabs.net.
Question and response
Question
dig _spf.itoolabs.net. NS
Answer
The response has no answer records.
Authority
itoolabs.net. 3600 SOA ns.itoolabs.com. hostmaster.itoolabs.com. 2026011201 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0