This app was mentioned in 2 comments, with an average of 2.00 upvotes
Maybe Stocktaking or a similar app would work? I've never used it or any other similar apps, but you should be able to find what you're looking for.
Fing is great for scanning devices on thenetwork. I meant for cataloguing stuff not yet on the network. I found this one and it has done the trick https://play.google.com/store/apps/details?id=de.primaapps.android.inventory