h0.s239.verisign.com has no CNAME records.
Question and response
Question
dig h0.s239.verisign.com. NS
Answer
The response has no answer records.
Authority
verisign.com. 8306 SOA av1.nstld.com. mdnshelp.verisign.com. 1772756341 300 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0