# Spamhaus - **Website:** - **Primary alias:** `abuseat.org` ## Description The Composite Blocking List (CBL) is a division of Spamhaus, a reputable organization dedicated to combating spam and email abuse. The CBL provides a comprehensive list of IP addresses that exhibit characteristics specific to open proxies, spam bots, and other forms of malicious activity. This valuable resource helps individuals and organizations identify and address potential security threats. The CBL takes its source data from large mail server installations, distinguishing itself by not listing IP addresses based on email volume. Instead, it focuses on identifying IPs infected with spam-sending viruses, worms, or acting as open proxies. It also lists certain portions of botnet infrastructure, such as infected machines and websites associated with botnets. To ensure accuracy and fairness, the CBL operates in an entirely automated manner and does not accept external submissions for listing. However, there is an expedient self-removal process available to affected parties. Before using the CBL, it is recommended to review their terms and conditions. The CBL can be queried using DNS-based blocking lists under the name cbl.abuseat.org, and if you require frequent queries, consider running your own local DNS server with CBL data. Please note that the CBL should only be used for blocking incoming mail, not authenticated access to outgoing mail servers. It is crucial to exempt authenticated clients from CBL checks to avoid spurious blocking. With its reliable data and efficient procedures, the CBL serves as a vital tool in the ongoing fight against email abuse and security threats. ## Industries - 🖥 Computers Electronics and Technology - 🖥 Computer Security _(under Computers Electronics and Technology)_ ## Links - [twitter](https://twitter.com/spamhaus) - [linkedin](https://linkedin.com/company/the-spamhaus-project) ## Logos & icons - icon _(primary)_ — PNG — [download](https://cdn.brandfetch.io/idbqPxlXCE/w/400/h/400/theme/dark/icon.png?c=1bxid64Mup7aczewSAYMX&t=1781435921425) ## Colors | Name | Hex | Theme | | --- | --- | --- | | Smalt | #00328d | accent | | Rhino | #293f65 | dark | | Whisper | #faf9fb | light | ## Fonts - Montserrat — asset _(google)_ - -apple-system — asset _(system)_ ## Imagery - banner _(primary)_ — JPEG — [download](https://cdn.brandfetch.io/idbqPxlXCE/w/1500/h/500/idokgRTkfx.jpeg?c=1bxid64Mup7aczewSAYMX&t=1781435921684) --- _Source: _ _See [/llms.txt](/llms.txt) for a full list of agent-readable pages, and [/auth.md](/auth.md) for how agents authenticate._