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I have been used many of them but found this one is the best for me.
It's simply, compact and direct to your job.
https://www.youtube.com/watch?v=Qb1sIatpUl0&feature=youtu.be
the App download link is here.
https://play.google.com/store/apps/details?id=com.nristek.apps.netztools
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