Comparison of IPv4 and IPv6

Sr No	IPv4	IPv6
01	It is 32-bit IP Address	It is 128-bit IP address
02	It is numeric address whose octets are separated by dot (.)	It is alphanumeric address whose octets are separated by colon (:)
03	It is written in decimal format	It is written in hexadecimal format
04	It has 5 different classes  i.e. Class-A, Class-B, Class-C, Class-D, Class-E	It does not have classes  i.e. classless
05	It support 232=4.3 billion IP address(limited)	It support 2128=3.4 x 1038 IP address(unlimited)
06	It supports VLSM(Variable Length Subnet Mask)	It does not support VLSM(Variable Length Subnet Mask)
07	Manual or DHCP based IP configuration	No need of manual or DHCP configuration. Nodes are capable of Auto-Configuration
08	It has lack of security at network layer	It has built-in strong security
09	Addresses used within LAN or organization given by network administrator are called “Private Address”	Addresses used within LAN or within organization are called “Unique Local Address”
10	Globally unique addresses used on public network(INTERNET) are called “Public Address”	Globally unique addresses used on public network(INTERNET) are called “Global Unicast Address”