Minimal bytes required in IPv4 header are 20 i.e. 20 bytes are mandatory. And total bytes in IPv4 header are 60.
IPv4 addresses are 4 bytes. IPv6 IP addresses are 16 bytes.
In case of IPv4, the address has 4 bytes. In case of IPv6, the address has 16 bytes.
IPv4 => 32 bits => 4 bytes
The size of an IPv4 address is 32 bits, or 4 bytes.
That's an iPv4 address. (4 bytes, 32 bits)
4th longword (bytes 13-16)
Header is always a multiple of 4bytes and so we can have a maximum length of the field as 15, so maximum size of the header is 60 bytes out of which 20 bytes are mandatory.
IPV4 uses a 4 byte address, whereas the IPV6 uses a 16 byte address. IPv4 has a possible 4,294,967,296 IP addreses. The IPv6 has over 300,000,000,000,000,000,000,000,000,000,000,000,000 possible address's.
IPV6 is less vulnerable to DNS Spoofing IPv4 addresses use 32 bit or 4 bytes for addressing IPv6 addresses use eight bit segments.
32 bits in a IPv4 address
IP version 6, also known as IPv6, IP next generation, or IPng. It uses addresses of 16 bytes, instead of the 4 bytes used in IPv4.