Guidance on the 911 S5 Residential Proxy Service

The Federal Bureau of Investigation (FBI), Defense Criminal Investigative Services (DCIS), and Department of Commerce (DOC) are publishing this announcement to notify the public of the dismantlement of the 911 S5 residential proxy service and to help individuals and businesses better understand and guard against 911 S5 proxy service and botnet.

911 S5 began operating in May 2014 and was taken offline by the administrator in July 2022 before rebranding as Cloudrouter in October 2023. 911 S5 was one of the largest residential proxy services and botnet with over 19 million compromised IP addresses in over 190 countries and confirmed victim losses in the billions of dollars.

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Source: U.S. Federal Bureau of Investigation Cyber Division

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