IP stands for internet protocol. So, IPv4 means internet protocol version 4 and IPv6 means internet protocol version 6.

Difference Between IPv4 and IPv6 | IPv4 vs IPv6


IPv4 is a 32-bit decimal address.IPv6 is a 128-bit hexadecimal address.
It  can produce 4.29×10(4,294,967,296) unique addresses.It can produce unique addresses.
It supports VLSM (Virtual Length Subnet Mask)It does not support VLSM ((Virtual Length Subnet Mask)
It consists of 4 octets.It consists of 16 octets.
In IPv4 checksum field is available.In IPv6 checksum field is not available
It has a header of 20-60 bytes.It has a header of 40 bytes (fixed)
It does not provide encryption and authentication.It provides encryption and authentication.
It has broadcast Message Transmission SchemeIt multicast and anycast message transmission scheme
In IPv4 fragmentation is done by Sender and forwarding routersIn IPv6 fragmentation performed by the sender only.
It supports manual and DHCP configuration.It supports manual, DHCP, auto-configuration, and renumbering.


  • IPv4 is a 32-bit address
  • IPv6 is a 128-bit hexadecimal address
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