subscriber.rspread.com has no CNAME records.
Question and response
Question
dig subscriber.rspread.com. NS
Answer
The response has no answer records.
Authority
rspread.com. 3546 SOA win-7lbvsc0nb6b. hostmaster. 111 900 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0