echo 'printf "10.%d.%d\n" $((RANDOM %256)) $((RANDOM %256))' > ip4temp1
echo 'printf "172.16.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.17.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.18.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.19.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.20.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.21.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.22.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.23.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.24.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.25.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.26.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.27.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.28.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.29.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.30.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "172.31.%d\n" $((RANDOM %256))' >> ip4temp1
echo 'printf "192.168.%d\n" $((RANDOM %256))' >> ip4temp1
shuf ip4temp1 -n 1 > ip4temp2
source ip4temp2
rm ip4temp1
rm ip4temp2