This list above is of DNS-based anti-spam databases. (DNS stands for Domain Name System, not for Do Not Solicit.) Most Internet service providers (ISPs) and web servers look to these lists for IP addresses linked to computers that send out spam or unwanted activity.

Your IP address might have resulted in the blacklisted symbol (IP Listed: Bad) appearing next to a few databases. It may be that at one point your IP address was flagged for some reason and blocked by some servers. (It could be that someone who was once assigned that IP address was blacklisted.)

Of course, if it seems that you're involved in spamming or other unwanted online behavior, your IP address could get blacklisted and blocked. It will get flagged and land on one or more of these databases. You'll be able to see that here at any time by running a new blacklist check.

Spam active IP can participate not only in spamming but also to participate in other types of attacks, such as fraud, DoS, DDoS, SQL and PHP injections, etc. and email addresses can be used to send spam via e-mail.