The best IP Scanner alternative to Angry IP Scanner is Nmap, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Angry IP Scanner and many of them are IP Scanners so hopefully you can find a suitable replacement. Other interesting IP Scanner alternatives to Angry IP Scanner are Fing, Zenmap, Advanced IP Scanner and Port Authority.
Angry IP Scanner alternatives are mainly IP Scanners, but if you're looking for
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Command line is generally more flexible than GUI and in this case the ability to use CIDR notation and specify ranges is a great improvement over Angry's simple start-stop.