What is the differences between ipv4 and ipv6

The Internet Protocol (IP) is a protocol which defines how the data can be sent from one computer to another on the Internet. Each computer which participates on the Internet has at least one IP address that uniquely identifies it from all other computers on the Internet.
 

What is IPv4?

Internet Protocol version 4 (IPv4) is the fourth version in the development of the Internet Protocol (IP) Internet and routes (Selecting best path to reach the destination) most traffic on the Internet.

Example IPv4 Address:
172.56.45.1

As shown above, IPv4 uses 32-bit (4 bytes, 4x8=32) addresses, which limits the total number of IP addresses to 4 294 967 296 (2³²).
 

What is need to go IPv6

The depletion of pool of the unallocated Internet Protocal Version 4 (IPv4), which eventually exhausted Feb 3,2011. Though it was siginificantly delayed, it is the reason for the development of IPv6.
 

What is IPv6?

It is the successor of IPv6 and uses 128-bit address, which allows 3.4 x 10³⁸ addressess totally. This total is more than 7.9 x 10²⁸ times as many as IPv4 can offer.

Example IPv6 address:
2001:0db8:85a3:0042:1000:8a2e:0370:7334
 

What is differnces between IPv4 and IPv6

 

IPv4 Address	IPv6 Address
IPv4 addresses are 32 bit length.	IPv6 addresses are 128 bit length.
IPv4 addresses are binary numbers represented in decimals.	IPv6 addresses are binary numbers represented in hexadecimals.
IPSec support is only optional.	Inbuilt IPSec support.
Fragmentation is done by sender and forwarding routers.	Fragmentation is done only by sender.
Checksum field is available in IPv4 header	No checksum field in IPv6 header.
No packet flow identification.	Packet flow identification is available within the IPv6 header using the Flow Label field.