What is the Malicious Domain Blocking and Reporting (MDBR) Service?

MDBR is a web security solution that provides an additional layer of cybersecurity protection that is proven, effective, and easy to deploy.

It implements recursive DNS technology that prevents IT systems from connecting to harmful web domains, helping limit infections related to known malware, ransomware, phishing, and other cyber threats. This capability can block the vast majority of ransomware infections just by preventing the initial outreach to a ransomware delivery domain.

MDBR is available at no cost to U.S. State, Local, Tribal, and Territorial (SLTT) government members of the Multi-State Information Sharing and Analysis Center (MS-ISAC) and the Elections Infrastructure Information Sharing and Analysis Center (EI-ISAC). This service was designed in partnership with the Cybersecurity and Infrastructure Security Agency (CISA) and Akamai.