mtaproxy2.aol.mail.vip.bf1.yahoo.com has no NS records.
NS records for this zone are defined at bf1.yahoo.com.
NS records for this zone are defined at bf1.yahoo.com.
Question and response
Question
dig mtaproxy2.aol.mail.vip.bf1.yahoo.com. NS
Answer
The response has no answer records.
Authority
bf1.yahoo.com. 600 SOA hidden-master.yahoo.com. hostmaster.yahoo-inc.com. 2026030303 28800 600 604800 600
Additional
. 0 OPT ; payload 1272, xrcode 0, version 0, flags 0