smtp02.uptodate.com has no NS records.
NS records for this zone are defined at uptodate.com.
NS records for this zone are defined at uptodate.com.
Question and response
Question
dig smtp02.uptodate.com. NS
Answer
The response has no answer records.
Authority
uptodate.com. 86400 SOA cbru.br.ns.els-gms.att.net. rm-hostmaster.ems.att.com. 2006092548 10800 5400 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0