mx1ces.nice.com has no NS records.
NS records for this zone are defined at nice.com.
NS records for this zone are defined at nice.com.
Question and response
Question
dig mx1ces.nice.com. NS
Answer
The response has no answer records.
Authority
nice.com. 900 SOA ns-32.awsdns-04.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0