[kh99]

I've had Comcast in several areas over the years, and my take is that while you do not normally get a static ip address, the fact is that it rarely changes and you might have the same address for years. I've even tried doing what someone suggested, unplugging the modem for a while and plugging it back in, only to get the same address back every time (maybe I was just lucky?). But that doesn't technically make it a static address. A static address would be one that was guaranteed not to change. It is possible that some customers do have a 'true' static ip address for one reason or another, but I don't think it's the norm because even if it doesn't ever seem to change, they could decide to change your address whenever they want (well, they probably need to wait for the DHCP lease to expire).

In any case, it still might be useful to block by ip address because a lot of times it *won't* change for a long time, and many people might not understand what's going on or want to bother trying to change their address. On the other hand, someone who really wants to annoy you will use a proxy server.