Abstract: Example methods, apparatus, systems and articles of manufacture to implement cooperative mitigation of distributed denial of service attacks originating in local networks are disclosed. An example local network router disclosed herein includes a mitigator to mitigate a distributed denial of service attack detected by an Internet service provider, the distributed denial of service attack associated with network traffic originating from a first device connected to a local network. The example local network router also includes a threat signaling server to identify the first device based on first information received from a threat signaling client of the Internet service provider, the first information describing the distributed denial of service attack. The example threat signaling server is also to transmit second information to notify the threat signaling client of the Internet service provider when the network traffic associated with the distributed denial of service attack has been mitigated.