To anyone asking questions:
No this is not illegal. Yes it works as far as I know (U-Verse here, both IP Ranges blocked.) Yes, you can easily reverse this.
If you have a router, block it there to get your whole network. If not, you can do it per device. Easiest in Windows is the hosts file (you'll need admin permissions). Droid users need root and Droidwall or Terminal. OSX users need temrinal. Linux users should use terminal.
I doubt you can IP block with the PS3 to posters above, just use your router.