The best Network Analyzer 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 12 are Network Analyzers so hopefully you can find a suitable replacement. Other interesting Network Analyzer alternatives to Angry IP Scanner are Fing, Port Authority, NETworkManager by BornToBeRoot and Advanced Port Scanner.
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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.