what is IPv6? all you need to know about IPv6 highlights and most important things about IPv6

• An IPv6 address contains 128 bits, a much larger address space than the address space in IPv4. It can provide approximately 3.4 * 10 ^ 38 addresses

•  IPv6 addresses are represented as a series of 16-bit fields presented as a hexadecimal number and separated by colons (:). The format used is x:x:x:x:x:x:x:x. 

1. The leading 0s in a field are optional
2.  You can use two colons (::) to compress successive hexadecimal fields of 0s at the beginning, middle, or end of an IPv6 address; this can be done one time in an address. example:

2031:0000:130F:0000:0000:09C0:876A:130B
or
2031:0:130F::9C0:876A:130B

IS THE SAME!

• It uses Unicast, Anycast and Multicast. That's it!

• Link-local address:An IPv6 unicast address that you can manually configure or have automatically configured on an IPv6 interface. When configured automatically, the address uses the link-local prefix FE80::/10 (1111 111010) and the interface identifier. Link-local addresses are used in the neighbor discovery protocol, the stateless autoconfiguration process, and many other control operations such as routing protocols.

• Site-local address:IPv6 unicast addresses that use the prefix FEC0::/10 (1111 111011) and concatenate the subnet identifier (the 16-bit field) with the interface identifier. These addresses are similar to RFC 1918 private addresses in IPv4; they are not advertised beyond the local site. This feature has been deprecated in the standards.