smtp2.ingenico.com has no NS records.
NS records for this zone are defined at ingenico.com.
NS records for this zone are defined at ingenico.com.
Question and response
Question
dig smtp2.ingenico.com. NS
Answer
The response has no answer records.
Authority
ingenico.com. 60 SOA dns1.p05.nsone.net. hostmaster.nsone.net. 1655811587 7200 1800 2419200 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0