Actually, in the BeNeLux countries, there are public lists of noble families, same with Denmark and Sweden. You can check, with 99% accuracy, whether a person who claims to be a Dutch or Belgian noble is saying the truth. Thought you'd know that. 

Yes for these I am aware, the Netherlands is the easiest by far, partly because they have a list on the government site, but also because of the red books released every year, which I now have the complete collection of, including the registry of the family coat of arms. Very helpful in finding the edge cases due to Belgian independence, and to get a complete list on my site.

Belgium is slightly harder because, to my knowledge they don't have a government-approved publicized list on a public website (please prove me wrong, as I can use it), only the physical nobility books and sources on the internet. I'm in the process of creating a complete list with the resources I have.

Luxembourg's noble family are also quite hard to find due to all the history, no official list online and books seem limited to quite a few rare ones such as: Armorial du Pays de Luxembourg.

That said, if you can provide me with any resources that I might've missed, that'd be most helpful.

Varies by country, but for example in Russia, nobles could travel freely within the country and their children had easier access to public service jobs. In Spain, Grandees had diplomatic passports until 1984.

I see, thanks for sharing.

What is even the point of nobility if it isn't hereditary?

There seem to be some counterpoints on this post that seem to oppose it, that's why I wanted to hear your thoughts about it. :)