[Ted S]

Host names can change just as easily as the IP and generally if one is dynamic the other is as well. Take a look at your example where there hostname is the ip (backwards) followed by the host's address. There are some isps who keep constant subnets but it's not common to let one id change and not the other as the two are usually related.

Remember, unlike bans we're working to get a 1-to-1 relationship so identifying entire host subnets would be ineffective. IPs are also limited as they can change and are duplicated by some ISPs which is why I did not include this initially.

The reality of the internet is that there is absolutely no way to insure someone is the same person when they return to a site.