gnat.yodlee.com has no NS records.
NS records for this zone are defined at yodlee.com.
NS records for this zone are defined at yodlee.com.
Question and response
Question
dig gnat.yodlee.com. NS
Answer
The response has no answer records.
Authority
yodlee.com. 900 SOA ns-157.awsdns-19.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0