Not aware of IPv6? Well, let me put in a short intro, we presently use IPv4 addressing, which is in the form of 220.127.116.11. Its time that all combinations of this 32 Bit address exhaust. So IPv6 is introduced, with an address length of 128 bits, which is considered to never exhaust[Eg: 2001:0db8:85a3:0000:0000:8a2e:0370:7334]
The Internet world have been prepping up for this day ever since, and now the day has come. Experts say the Users won't even know about the change into IPv6. The vast majority (99.95%) of people will be able to access services without interruption: either they’ll connect over IPv6, or their systems will successfully fall back to IPv4. However, as with any next-generation technology, there may be teething pains. Experts estimate that .05% of systems may fail to fall back to IPv4, so some people may find Google, Facebook, Yahoo, Bing and other participating websites slow or unresponsive on World IPv6 Day.
This is often due to misconfigured or misbehaving home networking equipment, such as home routers, that can make a computer think it has IPv6 connectivity when in fact it’s not working.
If you are curious to know whether you will have issues with IPv6 check in here - ipv6test.google.com/