If you're not using SSH's config file located at $HOME/.ssh/config for easily accessing a remote host without remembering which was the port, the FQDN or IP address, the remote user account or the SSH key you're using with it please do yourself a favor and go set it.
Each entry looks like this:
hostname <FQDN or IP address>
user <remote user>
port <remote port>
IdentityFile <local path to private key file>
Well, it happened to me that my co-workers had agreed upon aliases for a few hosts but for me it was much easy to remember a customized alias more akin to the one I could have come up with me myself so I tried adding a second and a third and even more aliases to the same entry and as long as they are unique they all work!
So you can go something like this:
host server018 mongodb-box mongo
Then you can connect with "ssh server018", "ssh mongodb-box" or "ssh mongo" as it pleases you or you happen to remember first.
That's about it :)