I think it would help if you told people what Ning did.
F-Droid
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Ah, good point. Will add an edit
Port authority
I currently use Android IP scanner which is pretty barebones but works https://apt.izzysoft.de/fdroid/index/apk/com.victorb.androidnetworkscanner
Before that I used Vernet but it stopped working for me a while ago for unknown reasons https://www.f-droid.org/packages/org.fsociety.vernet/
I checked Android IP Scanner and it hasnt been updated since early 2021 either. Vernet has been updated quite recently and works, but doesnt do what i need it to since i want to get ipv6 addresses too.
Fair enough, I haven't checked when it was updated last as I needed something quick so I just went through the listings.
Too bad vernet didn't work for you.
My suspicion is that nobody has made an app yet that will use IPv6 primarily.