DNSBL, RBL, SURBL, DNSWL Services, FREE Real Time Black & White List Services, RBL, DNSBL, SURBL, DNSWL, Spam Protection, Junk Email Filter, nsZones.com

(DNS BlackList or DNS Blackhole List or Realtime Blackhole List) A system for identifying spammers based on their IP addresses. Most mail servers are able to query a DNSBL to determine if a specific IP address is on the list.

DNSBL/RBL uses the DNS protocol to query the well-known IP addresses which have been complaint to send worm, virus & junk mail. Using RBLs to prevent junk, virus & worm email is very effective. The algorithm of RBLs is different with that of Anti-Spam and Anti-Virus services as RBLs works based on IP address, while Anti-Spam and Anti-Virus services work based on the message content.

SURBL is an abbreviation for Uniform Resource Identifier Blacklist. A SURBL lists domain names that appear in URIs such as web sites mentioned in message bodies. This is similar to a DNSBL but it lists domain names rather than IP addresses.

nsZones DNSBL tracks open relays, open proxies, Internet's spammers, spam gangs and spam services, provides dependable realtime anti-spam protection for Internet networks.

The project’s mission is to stop mail abuse, globally. We do not block emails. We just provide a tool for network/system/mail administrators to use to protect their mail servers from email abuse. Our goal is to provide a stable and effective dnsbl with clearly stated and strictly adhered to criteria for listing.

We know that there are a lot of solutions out there, which claim that they could stop spam, but they are really not effective.

If they could work, logically, you would have no reason to visit this website.

Using filtering software that accepts mail and then "marks spam as such" or “moves it to a spam folder” is a complete nonsense, because the spammer has already achieved what he intended to do.

The DNSBL / RBL can be queried directly as bl.nszones.com