AnonWatch

Wikiscanner

I ran into the wikiscanner, which I found very useful.

Using Wikiscanner you can check out who edited values on wikipedia.org while filtering on IP ranges or organization names.

Another interesting thing about Wikiscanner is the ability to add IP ranges to their list and identifying them as a specific organization.
Meaning, you can see stuff that aren’t shown on RIPE, ARIN, AFRINIC or all the other IP Authorities.

Try it, it’s interesting.