bison.kcom.com has no CNAME records.
Question and response
Question
dig bison.kcom.com. NS
Answer
The response has no answer records.
Authority
kcom.com. 4890 SOA ibex.kingston-internet.co.uk. hostmaster.kcom.com. 2026021702 28800 7200 2592000 28800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0