Network What Is a DNS Blacklist?

What Is a DNS Blacklist?


By using a computer, phone, tablet, or the web everything is much easier to remember from one’s everyday life.

DNSBL is a Domain Name System Blacklists, and is known as DNSBLs and also DNS Blacklists that enable the administrator of a website to block unwanted traffic from certain systems with a history of sending spam to people. The lists are based on the internet domain name system and turns complicated, numerical IP like to a domain name such as, which will make the lists easier to use, read, and search.

If the person that maintains a DNS Blacklist Database ever received spam from a certain domain name, that server would get blacklisted and the messages sent from that server would be flagged or rejected from all sites using that list.

A DNS Blacklists goes all the way back to 1997 to the time it was first created. In the beginning it went by the name of RBL and its purpose was the same as it is now, to block spam email, educate internet service providers, as well as websites of spam, and spam related issues. The modern DNS Blacklists are not used for educational tools often, and their main purpose today is to block emails and files.

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Furthermore, nearly all of the email servers today support a DNSBL to be able to lower the amount of what is referred to as “junk mail” getting into their clients’ inbox. There are three key components making up a DNS Blacklist: a domain name, a name for the host, and a list of addresses. Things are pretty much the same as they were when RBL was originally created.

There have been dozens of other DNSBLs since then that have been available to use, and they have lists of their own as well. Their lists are based on what meets their standards and what doesn’t meet their standards for the criteria of what they feel a spammer is. On the account of this, the DNS Blacklists are going to vary from one to another greatly.

Some of them will have a base stricter than the others, whereas some will list sites for only a period of time, and others may block their IP, along with the entire list of ISPs known to be harboring spammers. It results in some of the lists doing a better job than others on the account of them being managed by services that have more credibility and a higher level of trustworthiness.

Depending on users’ security needs they will be able to choose for themselves which DNS Blacklist is going to work best for them. If the lists were not so strict it might would allow some spam to get through. In order to help in facilitating the DNS Blacklists intended to be used publicly they will most likely have a specific published policy. It details a list definition which has to adhere to criteria that have been laid out to keep the public’s trust and their confidence in the services given, but also sustaining it.

If interested, you can click on an antispam database right now to see if your IP address shows up. Also, find out whether your email and/or forums are being blocked.

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