smtp2.a.stepstone.com has no NS records.
NS records for this zone are defined at stepstone.com.
NS records for this zone are defined at stepstone.com.
Question and response
Question
dig smtp2.a.stepstone.com. NS
Answer
The response has no answer records.
Authority
stepstone.com. 86400 SOA ns.domainnetwork.se. hostmaster.cscdns.net. 2013112941 14400 3600 2419200 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0