s1._domainkey.atlassian.net has no NS records.
NS records for this zone are defined at atlassian.net.
NS records for this zone are defined at atlassian.net.
Question and response
Question
dig s1.domainkey.u9256.wl007.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl007.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2400140593 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0