Most recent edit on 2006-11-28 21:33:11 by DbieL [Added Links and minor text edits]

Additions:
So what is DNS to begin with? Every computer connected to the internet has an IP address associated with it. This IP address looks something like 64.233.187.99 . But since it is tough remember these numbers, each machine's IP address is usually given a name which can be remembered. For example, the above IP address 64.233.187.99 is associated with www.google.com∞. If you want to know the IP address that your machine is using currently, go to www.whatismyip.com∞. The DNS essentially translates the name of the machine (in this case www.google.com) to the IP address (in this case 64.233.187.99). A server which provides this service is called "DNS server". More information on DNS can be found at Wikipedia:Domain_Name_System∞.

A DNSbl is simply a list of IP addresses which satisfy a particular criterion. SpamCop's DNSBL is called SCBL (spamcop blocking list). There are many other DNSbl's out there besides SCBL. Depending the criterion used to build these DNSbls, they can be used for various purposes. For example, the SCBL can be used by mail servers, network servers to identify potential spam email. There are DNSbls which can be used to identify trusted IP addresses, specific ISP's, countries etc.,
The following is not exactly related to DNSbl but is related to SCBL . Please consider deleting this...

The SpamCop.net DNSbl lists IP addresses that spam has been reported to originate from. It is aggressive, and may list real mail servers.
Some list only IP addresses that have been shown to be compromised and abused by spammers. Others list IP addresses that are known to be controlled by spammers.
And some list IP addresses that are DHCP∞ assigned. These are known as Dyanmic list and sometimes DIALUP lists. Many mail servers will not accept e-mail from these addresses.
Use of conservative DNSbls can block over 80% of the incoming spam usually with out any real e-mail being rejected unless the sender's mail server has a severe security problem. Adding a good DHCP∞ blocking list to that can eliminate most of the remaining spam with a very small chance of rejecting a real e-mail.
An aggressive DNSbl can be used to indicate if additional tests should be done on an incoming e-mail to see if it is spam or real e-mail.
CategoryPagesUnderConstruction

Deletions:
So what is DNS to begin with? Every computer connected to the internet has an IP address associated with it. This IP address looks something like 64.233.187.99 . But since it is tough remember these numbers, each machine's IP address is usually given a name which can be remembered. For example, the above IP address 64.233.187.99 is associated with www.google.com∞. If you want to know the IP address that your machine is using currently, go to www.whatismyip.com∞. The DNS essentially translates the name of the machine ( in this case www.google.com) to the IP address (in this case 64.233.187.99). A server which provides this service is called "DNS server". More information on DNS can be found here∞.

A DNSbl is simply a list of IP addresses which satisfy a particular criterion. Spamcop's DNSBL is called SCBL (spamcop blocking list). There are many other DNSbl's out there besides SCBL. Depending the criterion used to build these DNSbls, they can be used for various purposes. For example, the SCBL can be used by mail servers, network servers to identify potential spam email. There are DNSbls which can be used to identify trusted I.P. addresses, specific ISPs, countries etc.,
The following is not exactly related to DNSbl but is related to SCBL. Please consider deleting this...

The spamcop.net DNSbl lists I.P. addresses that spam has been reported to originate from. It is aggressive, and may list real mail servers.
Some list only I.P. addresses that have been shown to be compromised and abused by spammers. Others list I.P. addresses that are known to be controlled by spammers.
And some list I.P. addresses that are DHCP∞ assigned. These are known as Dyanmic list and sometimes DIALUP lists. Many mail servers will not accept e-mail from these addresses.
Use of conservative DNSbls can block over 80% of the incoming spam usually with out any real e-mail being rejected unless the sender's mail server has a severe security problem. Adding a good DHCP∞ blocking list to that can eliminate most of the remaining spam with a very small chance of rejecting a real e-mail.
An aggressive DNSbl can be used to indicate if additional tests should be done on an incoming e-mail to see if it is spam or real e-mail.

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Oldest known version of this page was edited on 2006-11-10 18:22:48 by KamarajU []

DNSbl

The spamcop.net DNSbl lists I.P. addresses that spam has been reported to originate from. It is aggressive, and may list real mail servers.
Some list only I.P. addresses that have been shown to be compromised and abused by spammers. Others list I.P. addresses that are known to be controlled by spammers.
These are known as conservative DNSbls.

And some list I.P. addresses that are DHCP∞ assigned. These are known as Dyanmic list and sometimes DIALUP lists. Many mail servers will not accept e-mail from these addresses.

Use of conservative DNSbls can block over 80% of the incoming spam usually with out any real e-mail being rejected unless the sender's mail server has a severe security problem. Adding a good DHCP∞ blocking list to that can eliminate most of the remaining spam with a very small chance of rejecting a real e-mail.

An aggressive DNSbl can be used to indicate if additional tests should be done on an incoming e-mail to see if it is spam or real e-mail.
Also see rDNS

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CategorySpamCopGlossaryWikiD

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