Earlier this year I went on a long holiday to Japan and China. I have an Android phone and am a very big fan of OpenStreetMap. So I used OsmAnd (which uses OpenStreetMap data) to navigate through those countries. I made a spreadsheet with LibreOffice, which included a few links to certain location which are hard to find or do not have an address. Then I exported that .ods to a .pdf and was able to click on the links, which then openend perfectly in OsmAnd.
Since IPv6 is happening, we should be prepared. During the deployment of a new accesspoint I was in need of a Unique Local Address. IPv6 Unique Local Addresses basically are comparable to the IPv4 private address ranges.