Discover a comprehensive list of blocklists databases that undergo automatic checks whenever new subnets are uploaded to IPXO marketplace. 

IPXO prioritizes IP reputation and actively monitors prominent databases to ensure that no blocklisted IPs are accepted. Explore these databases, which aim to assist you in verifying the status of IP addresses and delisting them on your end. 

Blocklist NameLookup URL Description 
Spamhaus SBL Spamhaus Block List ('SBL') Advisory is a database of IP addresses that Spamhaus recommends avoiding for receiving email. 
Spamhaus PBL Spamhaus PBL is a DNSBL database of end-user IP address ranges that should not be delivering unauthenticated SMTP emails to any Internet mail server, except for those explicitly designated by an ISP for the customer’s use. 
Barracuda Central Barracuda Reputation System is a real-time database of IP addresses that have a poor reputation for sending valid emails. Barracuda Central maintains and manually verifies all IP addresses marked as "poor" on the Barracuda Reputation System. 
0SPAM in the 0spam Blacklist indicates that your computer/server or a previous user of this IP sent spam to a trap, or computers and/or servers within your Class C IP network are sending large amounts of spam to the 0spam spam traps. 
SPAMCOP determines the origin of unwanted email and reports to the relevant Internet service providers. 
SORBS SPAM SORBS (Spam and Open Relay Blocking System) provide free access to its DNS-based Block List (DNSBL) to effectively block emails from more than 12 million host servers known to disseminate spam, phishing attacks and other forms of malicious emails. 
S5hbl s5h blacklist is a real-time IP-based blacklist maintained by the System 5 Hosting (S5H) organization, designed to help network administrators and security professionals block known sources of spam and other malicious activities from accessing their networks. 
IBM X-Force Exchange is a cloud-based, threat intelligence sharing platform that you can use to rapidly research the latest global security threats, aggregate actionable intelligence, consult with experts and collaborate with peers. 
AntiSpam by CleanTalk provides lists of spam active IPs and email addresses that have been identified as actively involved in spamming on websites, as well as lists of domains that are being promoted through spam. 
Uceprotect is a DNS blacklisting service that operates through three distinct zones:,, and, used to identify and list IP addresses that are associated with spamming or other malicious activities. For more information, visit