GreyNoise Labs has launched a free tool called GreyNoise IP Check that lets users check if their IP address has been observed in malicious scanning operations, like botnet and residential proxy networks.

The threat monitoring firm that tracks internet-wide activity via a global sensor network says this problem has grown significantly over the past year, with many users unknowingly helping malicious online activity.

“Over the past year, residential proxy networks have exploded and have been turning home internet connections into exit points for other people’s traffic,” explains GreyNoise.