OpenSSH client and known_hosts

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Using the ssh client packaged with OpenSSH, is it possible to keep track
of the ports along with host/IP information in known_hosts without
modification to the client? I ssh into a few servers in a NAT that have
sshd running on different ports with different ssh host keys, and having
to constantly edit my known_hosts file can get tedious.

I'm sure someone else here was/is in a similar situation, any thoughts?

Thanks,
Devin
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