Comparison of DNS blacklists

DNS blacklists (DNSBLs) are databases that use the Domain Name System (DNS) to list IP addresses known or suspected to be sources of spam, malicious activity, or other undesirable behavior. They are commonly used in email filtering and network security to prevent unwanted communications from reaching users. Comparing DNS blacklists can involve several aspects: ### 1. Purpose and Focus - **Spam Prevention**: Some DNS blacklists focus primarily on identifying IP addresses used for sending spam emails (e.g.