Today's internet has room to expand for tomorrow.
There are 2 types of IP addresses on the internet - IPv4 & IPv6. IPv4 addresses are still used in everyday browsing, but despite IPv4 having over 4.3 billion IP addresses available, in 2015 the American Registry for Internet Numbers posted that the last IPv4 address had been handed out.
ARIN gives the internet an update on IPv4
We might be short on IPv4, but not on IPv6!#get6— ARIN (@TeamARIN)July 2, 2015
With the IPv4 address pool exhausted, a new specification was created called IPv6. As of 2016, there are 7.4 billion humans on earth and IPv6 should be able to handle everyone with over 340 undecillion+ IPv6 addresses.
An IPv4 address looks like this:192.168.1.1.
With IPv4 finished, IPv6 will be the new standard. On June 6th 2012, a big push toward using IPv6 led many organizations (including Microsoft, Apple, Google and Facebook) to begin accepting the new specification.
Vint Cerf, the“father of the internet” who co-created IP, has been instrumental in helping the move from IPv4 to IPv6. Now at Google as the chief internet evangelist, Cerf explains the move.
“If we don't implement [IPv6]... the IPv4 address space will be exhausted”
What happened to IPv5?
It was designated to an experimental protocol called “internet streaming protocol” but unfortunately it was never fully deployed.
IPv6 is still in the process of being supported by all websites and ISPs, but you can always check with Google who’s created a great resource to see how far your ISP has moved toward fully implementing IPv6.