Remove SSH keys from known host file by IP address

Github had a situation which caused the need to potentially remove Github's keys from your known_hosts file.

This can be done easily with the SSH command:

ssh-keygen -R github.com

This is great... except when it isn't. I specifically ran into an issue where my connection was trying to utilize specific github IP addresses. Have no fear... it turns out that the same command can be utilized.

ssh-keygen -R 140.82.114.4

I actually had to do a few of them

ssh-keygen -R 140.82.113.3

etc...

You could potentially use github's meta information endpoint to find address ranges, but that's a problem for a more clever person.

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