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nsupdate -k Kfoo22.bar44.com.+157+12505.private
 #or 
nsupdate -y keyname:secret
command Add CNAME To Zone 
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nsupdate
server 192.168.31.50
zone example.com.
update add www.example.com. 86400 CNAME example.com.
show
send
command Delete CNAME From Zone 
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nsupdate
server 192.168.31.50
zone example.com.
update delete www.example.com. CNAME
show
send
command nslookup example
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nslookup www.example.com 192.168.31.50