Two tools able to edit your ipfilter.dat . These tools are able to edit your ipfilter.dat in order to check for big ranges and to check adjacent ranges . From the creators of ipfilterX , Nexus23 Labs . - Updates in Progress -
SafePeer allows you to retrieve IP ranges to which some other software should not connect to. The main purpose of SafePeer is to be a plugin for Azureus, importing IP ranges retrieved from some sources to the IpFilter.