The mailspike services are intended to provide all receivers and reputation providers a baseline of data to help block the senders with the worst reputations. All IP addresses listed these lists are being continually monitored and the lists are updated frequently.
The z.mailspike.net lists all IP addresses seen participating in a distributed spam wave.
Is the information on our site wrong or incomplete? You don't want us to monitor your blacklist? Or do you operate a similar blacklist? We would like to hear from you!
We keep some statistics on blacklists. Below is the graph for z.mailspike.net. We test blacklists by asking them to respond to known IP's that are blacklisted and known IP's that can't be blacklisted. Not every blacklist has such IP's, we test them with what is possible. We keep if we get any response or error messages and the response duration. Lower response times are better. These statistics may be useful for email server administrators to pick which blacklist to use.