Arpwatch is described as 'Computer software tool for monitoring Address Resolution Protocol traffic on a computer network. It generates a log of observed pairing of IP addresses with MAC addresses along with a timestamp when the pairing appeared on the network' and is a network analyzer in the security & privacy category. There are seven alternatives to Arpwatch, not only websites but also apps for a variety of platforms, including Windows, Linux, Android, iPhone and iPad apps. The best Arpwatch alternative is NetCut, which is free. Other great sites and apps similar to Arpwatch are elmoCut, TuxCut, CSArp-Netcut and Netkillui.