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For example- the IPv6 address FEDC: 0001: 0000: 0000: 0000: 0000: ABDC: 0FF0 can be compressed to FEDC: 1:: ABDC: FF0.For example- 0:0:0:0:0:0:10.1.8.24 or in compressed form ::10.1.8.24

IPv6 address prefixes can be written in a manner similar to CIDR notation ipv6-address/ prefix-length where

ipv6 address is an IPv6 address

prefix-length is a decimal value specifying how many leftmost contiguous bits of the address comprise the prefix.Unicast Addresses:

Aggregatable global unicast addresses are analogous to routable IPv4 IP addresses.The variable-length field comprising of these leading bits is called Format Prefix (FP).They are assigned in blocks to ISPs, who then assign portions of the addresses to businesses and end users.The IPv6 global aggregatable global unicast address format is as follows-Also, the IPv6 address FEDC: 0000: 0000: 0001: 0000: 0000: ABDC: 0FF0 can be compressed to FEDC :: 1: 0: 0: ABDC: FF0.Unicast addresses are distinguishable from Multicast addresses from high-order octet of the addresses.

For example- the IPv6 address FEDC: 0001: 0000: 0000: 0000: 0000: ABDC: 0FF0 can be compressed to FEDC: 1:: ABDC: FF0.

Also, the IPv6 address FEDC: 0000: 0000: 0001: 0000: 0000: ABDC: 0FF0 can be compressed to FEDC :: 1: 0: 0: ABDC: FF0. The "::" cannot appear twice in an address.

And, IPv6 address 0000: 0000: 0000: 0000: 0001: FEDC: ABDC: 0FF0 can be compressed to :: 1: FEDC: ABDC: FF0.

Rule 4: When dealing with a mixed IPv4 and IPv6 environment, the X:X:X:X:X:X.d.d.d.d is used where "X" are hexadecimal values of six high-order 16-bit pieces of the address, and "d" are the decimal values of four low-order 8-bit pieces of the address (the actual 32-bit IPv4 address).

For example- 0:0:0:0:0:0:10.1.8.24 or in compressed form ::10.1.8.24

IPv6 address prefixes can be written in a manner similar to CIDR notation ipv6-address/ prefix-length where

ipv6 address is an IPv6 address



prefix-length is a decimal value specifying how many leftmost contiguous bits of the address comprise the prefix.

For example- the following are legal representations of 60-bit prefix 1234: 0000: 0000: 0CB3.

1234: 0000: 0000: CB3: 0000: 0000: 0000: 0000/60



1234: 0: 0: CB3::/60



1234::CB3: 0: 0: 0: 0/60

However, 1234::CB3/60 is illegal since it means 1234: 0: 0: 0: 0: 0: 0: CB3/60.

Address Type Allocation:

The specific type of an IPv6 address is specified using the leading bits in the address. The variable-length field comprising of these leading bits is called Format Prefix (FP).

Unicast addresses are distinguishable from Multicast addresses from high-order octet of the addresses. A value of FF (11111111) indicates a Multicast address, anything else is a unicast address. Anycast addresses are taken from Unicast address space, but they are not distinguishable from unicast addresses.

Unicast Addresses:

Aggregatable global unicast addresses are analogous to routable IPv4 IP addresses. They are assigned in blocks to ISPs, who then assign portions of the addresses to businesses and end users.

The IPv6 global aggregatable global unicast address format is as follows-