Can the WordPress.com comment blacklist differentiate between dynamic and static IP addresses?
If so, how?
If not, then how do we know it's doing what it is supposed to do, block the IP of the user sending the comment.
According to the Wikipedia article on dynamic addresses, a dynamic IP address can have as many as 16,777,216 variations (2 to the 24th power). Network administrators may divide such a block into smaller subnets, but we're still talking large numbers of variant IP's for each unique address in the network.
So what does WordPress.com do in the way of identifying whether the IP of a spammer is dynamic or not? It's an important distinction: Dynamic or Static, because
a. If dynamic IP 184.108.40.206 leaves spam on my site this minute, the user A at that IP can reset the modem or otherwise reset the IP in the next instant. The new IP might be 220.127.116.11, or 18.104.22.168, or millions of other variants in the block.
b. Also, that IP which sent the offending spam, may now be reassigned to any of millions of other users in a server network, or subnet.
So how does placing such a dynamic IP address in a WordPress blog "Comment Blacklist" serve any useful purpose? At best it may block the offender only momentarily. But it may soon block another non-offending user for no reason at all other than that user was assigned an IP previously assigned to an spammer.
Blog url: http://songbook1.wordpress.com/