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It would be easier to use sed:
sed 's/\./:/4'
Regards,
Alister

echo 74.125.224.194.80 | awk -F"." 'NF==5{v=$NF;sub(/\.[0-9]+$/,":"v)}1'

If you really dont want the data why are you using 'awk' command.

If you still want to send output to nowhere
try

your awk command > /dev/null