ns2.siteground.biz has no NS records.
NS records for this zone are defined at siteground.biz.
NS records for this zone are defined at siteground.biz.
Question and response
Question
dig ns2.siteground.biz. NS
Answer
The response has no answer records.
Authority
siteground.biz. 14400 SOA ns1.siteground.net. sysadmin.siteground.com. 2009063800 3600 7200 360000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0