IPv4 addresses is running out. One factor is because VPS are going cheap nowadays. Do you know how many IPv4 addresses does Digital Ocean currently use?
<a href="http://bgp.he.net/search?search%5Bsearch%5D=digital+ocean" rel="nofollow">http://bgp.he.net/search?search%5Bsearch%5D=digital+ocean</a> returns a list of Digital Ocean's ASes. An AS is a top-level chunk of the network, so you may assume that Digital Ocean operates seven technically independent networks with a total of about half a million IPv4 addresses.<p>By way of comparison: Before the strict IPv4 rationing regimes came into force, v4 addresses were being allocated at rate of about half a million <i>per day</i>.
From this[1] 2014 article:<p>> As of November, DigitalOcean counts a total 187,866 active users running a cloud server (or “Droplet”)<p>Hard to tell if the number is active users or active droplets.<p>[1]: <a href="http://wptavern.com/digitalocean-is-now-the-third-largest-hosting-provider-wordpress-droplets-account-for-23" rel="nofollow">http://wptavern.com/digitalocean-is-now-the-third-largest-ho...</a>