www.xundns.com has no NS records.
NS records for this zone are defined at xundns.com.
NS records for this zone are defined at xundns.com.
Question and response
Question
dig 307527339880223744.url.xunurl.com. NS
Answer
The response has no answer records.
Authority
xunurl.com. 7200 SOA n1.xundns.com. nsadmin.xundns.com. 437896 3600 600 86400 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0