An IPv6 IP address is a 128-bit address listed as eight 16-bit hexadecimal sections. Leading zeros can be omitted in each section. Therefore, 6384:1319:7700:7631:446A:5511:8940:2552 and 141:0:0:0:15:0:0:1 are both valid IPv6 addresses. A single set of all-zero sections can be abbreviated with two colons (::). Therefore, 141::15:0:0:1 would be a valid way of writing that address. Digits in a hexadecimal system range from 0-9 and A-F. H is not a valid hexadecimal number. 343F:1EEE:ACDD:2034:1FF3:5012 is too short, having only six sections instead of eight.
FEC0::AB:9007 is a valid IPv6 address. The :: in the address replaces blocks of consecutive 0’s. The longer form of this address would be FEC0:0000:0000:0000:0000:0000:00AB:9007. Leading 0’s within a quartet can be omitted. You can only omit one block of 0’s using the double colon. Each number in the IPv6 address must be between 0-9 or A-F; G is not a valid number for the IPv6 address. An address without double colons should have a total of 32 hexadecimal numbers in 8 blocks.
IP version 6 addresses are made up of 32 hexadecimal numbers, organized into 8 quartets. The quartets are separated by colons. An IPv6 address is a 128-bit number (128 binary digits). IP version 4 addresses use decimal numbers, organized into 4 octets and separated by periods.
Eight hexadecimal quartets
IP version 6 addresses are 128-bit addresses. They are commonly written using 32 hexadecimal numbers, organized into 8 quartets. Each quartet is represented as a hexadecimal number between 0 and FFFF. The quartets are separated by colons. IP version 4 addresses are 32-bit addresses. They have four octets, each octet being a binary number of 8 digits. Each octet has a decimal value between 0 and 255.
The last 64 bits of an IPv6 address
An IPv6 address is a 128-bit binary number that uses the first 64 bits as the address prefix and the last 64 bits of the address as the interface ID. The 128-bit binary number is organized into 32 hexadecimal numbers that are organized further into 8 quartets. The last 4 quartets correspond with the last 64 bits of the IPv6 address.
The first 4 quartets of an IPv6 address
An IPv6 address is a 128-bit binary number that uses the first 64 bits as the address prefix and the last 64 bits of the address as the interface ID. The 128-bit binary number is organized into 32 hexadecimal number that are organized further into 8 quartets. The first 4 quartets correspond with the first 64 bits of the IPv6 address.
Which quartet in the example IPv6 prefix is used to identify the subnet?
-F631 (the last quartet in the prefix)
Which part of the example IPv5 address is the interface ID?
The part of the IPv6 address that identifies the subnet address is the last quartet in the prefix.
For example the following address, FEC0:1319:7700:F631:446A:5511:CC40:25AB, the quartet used to identify the subnet is F631