mail.cds-global.com has no NS records.
NS records for this zone are defined at cds-global.com.
NS records for this zone are defined at cds-global.com.
Question and response
Question
dig u21890913.wl164.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl164.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2397589830 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0