mail.allianzgi.com has no NS records.
NS records for this zone are defined at allianzgi.com.
NS records for this zone are defined at allianzgi.com.
Question and response
Question
dig mail.allianzgi.com. NS
Answer
The response has no answer records.
Authority
allianzgi.com. 300 SOA pdns1.ultradns.net. dnsadmin.allianzgi-us.com. 2014074196 10800 1800 3600000 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0