I am not really sure what you're asking. This post doesn't make a whole lot of sense. It sounds like you want to have an array mapping the remote hostnames and IPs? If so, then just use an array:
array set remotes [list]
set remotes(HOSTNAME1) IP1
set remotes(HOSTNAME2) IP2
...
You can then index this array either by key, or you can use commands like [array names remotes] to get a list of keys, and then iterate over that.
