The Spam and Open Relay Blocking System IPv4

The SORBS (Spam and Open Relay Blocking System) provides free access to its DNS-based Block List (DNSBL) to effectively block email from more than 12 million host servers known to disseminate spam, phishing attacks and other forms of malicious email. The list typically includes email servers suspected of sending or relaying spam, servers that have been hacked and hijacked, and those with Trojan infestations. In an attempt to provide preemptive protection, SORBS also lists servers with dynamically allocated IP addresses.

• dnsbl.sorbs.net - Aggregate zone (contains all the following DNS zones except spam.dnsbl.sorbs.net)
• http.dnsbl.sorbs.net - List of Open HTTP Proxy Servers.
• socks.dnsbl.sorbs.net - List of Open SOCKS Proxy Servers.
• misc.dnsbl.sorbs.net - List of open Proxy Servers not listed in the SOCKS or HTTP lists.
• smtp.dnsbl.sorbs.net - List of Open SMTP relay servers. web.dnsbl.sorbs.net - List of web (WWW) servers which have spammer abusable vulnerabilities (e.g. FormMail scripts) Note: This zone now includes non-webserver IP addresses that have abusable vulnerabilities.
• new.spam.dnsbl.sorbs.net - List of hosts that have been noted as sending spam/UCE/UBE to the admins of SORBS within the last 48 hours.
• recent.spam.dnsbl.sorbs.net - List of hosts that have been noted as sending spam/UCE/UBE to the admins of SORBS within the last 28 days (includes new.spam.dnsbl.sorbs.net).
• old.spam.dnsbl.sorbs.net - List of hosts that have been noted as sending spam/UCE/UBE to the admins of SORBS within the last year. (includes recent.spam.dnsbl.sorbs.net).
• spam.dnsbl.sorbs.net - List of hosts that have been noted as sending spam/UCE/UBE to the admins of SORBS at any time, and not subsequently resolving the matter and/or requesting a delisting. (Includes both old.spam.dnsbl.sorbs.net and escalations.dnsbl.sorbs.net).
• escalations.dnsbl.sorbs.net - This zone contains netblocks of spam supporting service providers, including those who provide websites, DNS or drop boxes for a spammer. Spam supporters are added on a 'third strike and you are out' basis, where the third spam will cause the supporter to be added to the list.
• block.dnsbl.sorbs.net - List of hosts demanding that they never be tested by SORBS.
• zombie.dnsbl.sorbs.net - List of networks hijacked from their original owners, some of which have already used for spamming.
• dul.dnsbl.sorbs.net - Dynamic IP Address ranges (NOT a Dial Up list!)
• rhsbl.sorbs.net - Aggregate zone (contains all RHS zones)
• badconf.rhsbl.sorbs.net - List of domain names where the A or MX records point to bad address space.
• nomail.rhsbl.sorbs.net - List of domain names where the owners have indicated no email should ever originate from these domains.

Example Response Message

This is what you would see if your IP was listed as a dynamic IP address thus listed on dul.dnsbl.sorbs.net:

Dynamic IP Addresses See: http://www.sorbs.net/lookup.shtml?XXX.XXX.XXX.XXX

Are you the maintainer of dnsbl.sorbs.net?

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!