"The Old Internet is built on Internet Protocol version 4. This was first used on ARPANET in 1983. It's the IP version that launched the modern Internet. It's what we - or at least the general public - think of as an IP address. Under the covers it's a 32 bit long identifier, but it's always displayed as four decimal numbers separated by periods, e.g. "208.87.129.176"."
"IPv6 machines only like to talk to other IPv6 machines, but there are a bunch of protocols and widgets to help IPv6 clients reach IPv4 servers. It's critical that we can do that because there are a lot of consumers who are on IPv6 only networks - large broadband providers, cellphone networks - and a lot of servers that only serve traffic on IPv4."
There are two separate Internet protocol families in active use: IPv4 and IPv6. IPv4 uses 32-bit addresses displayed as dotted decimal (e.g. "208.87.129.176") and originated on ARPANET in 1983. IPv6 uses 128-bit addresses displayed as hexadecimal colon-separated segments (e.g. "2602:ff16:6:0:1:364:0:1") and began deployment in the late 1990s. IPv4-only and IPv6-only hosts do not natively interoperate. Many consumer networks such as large broadband and cellular providers run IPv6-only access while many servers remain IPv4-only. ISPs commonly deploy translation or gateway mechanisms (NAT/NAT64) to bridge clients and servers, which works well for web browsing but requires extra work for other protocols.
Read at Wordtothewise
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