DA, no, that is where you are in error, I beleive! You cannot block a whole ISP!
He has banned certain people, uf_pike for an example. But this bad pee"ney who keeps showing back up on site under a different name!

Many as a matter of fact!
But, thanks to the many Sharp People and the stupidity of the poster, He/She/they are found out very quickly and reported.
John, is truely the only one to Ban posters. While Mods do see these people most are wary of recommendation of banning to John. Usually the reasons are very obvious as they become total Asses.
As you will learn the Hard way, if it gets out of hand on the Thread you are a Mod on, You can Block/Lock, delete or recommend that they be Banned.
With The site that you are on, it do get hairy so can only suggest taht you confer with your fellow Mods before a decision is made!
Rudey, that is why some people who have been banned return, it is because of different log on names. See?
But, John can check out the ISP to see if it is the same Moron!
John aint heavy, He is My Leader!