authenticity of host can't be established ssh mac code example

Example: The authenticity of host '167.99.237.42 (167.99.237.42)' can't be established. ECDSA key fingerprint is SHA256:d2SMtu3Rc/9k+mKS21KB1ETsgoLWstqmB3LSXhjVEu8. Are you sure you want to continue connecting (yes/no)? yes

ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no