mail173.netdesignhost.com has no NS records.
NS records for this zone are defined at netdesignhost.com.
NS records for this zone are defined at netdesignhost.com.
Question and response
Question
dig mail173.netdesignhost.com. NS
Answer
The response has no answer records.
Authority
netdesignhost.com. 3600 SOA win-alfftollgm4. webmaster.netdesignhost.com. 20093135 900 600 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0