app.sensedata.com.br has no NS records.
NS records for this zone are defined at sensedata.com.br.
NS records for this zone are defined at sensedata.com.br.
Question and response
Question
dig u6102634.wl135.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl135.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2398277903 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0