Given the recent post <a href="https://news.ycombinator.com/item?id=25728175" rel="nofollow">https://news.ycombinator.com/item?id=25728175</a> I was wondering how hard it would be to predict or brute force scan YouTube video ids, to find private ones.<p>It turns out that they are using 64-bit integers as IDs, allocated in some unspecified order, so scanning all of them is not practical.