grep -e '^10\.0\.3\.' ~/.ssh/known_hosts | cut -f1 -d\  \
    | xargs --verbose -r -n1 ssh-keygen -f ~/.ssh/known_hosts -R
sudo grep -e '^10\.0\.3\.' ~root/.ssh/known_hosts | cut -f1 -d\  \
    | sudo xargs --verbose -r -n1 ssh-keygen -f ~root/.ssh/known_hosts -R