You can apply address compression to this address; because
the address is all zeroes, the address becomes just ::.
Global unicast addresses are de?¬?ned by a global routing pre?¬?x, a subnet ID, and an
interface ID. The IPv6 unicast address space encompasses the entire IPv6 address range,
with the exception of FF00::/8 (1111 1111), which is used for multicast addresses. The
current global unicast address that is assigned by the Internet Assigned Numbers Authority
(IANA) uses the range of addresses that start with binary value 001 (2000::/3), which is
1/8 of the total IPv6 address space and is the largest block of assigned block addresses.
Addresses with a pre?¬?x of 2000::/3 (001) through E000::/3 (111) are required to have 64-
bit interface identi?¬?ers in the extended universal identi?¬?er (EUI)-64 format.
The IANA is allocating the IPv6 address space in the ranges of 2001::/16 to the registries.
Figure 7-9 outlines the IPv6 format for a global unicast or anycast address.
Figure 7-9 IPv6 Address Format
The global unicast address typically consists of a 48-bit global routing pre?¬?x and a 16-bit
subnet ID. Individual organizations can use a 16-bit subnet ?¬?eld called ???Subnet ID??? to
2001
Registry
ISP Prefix
Site Prefix
Subnet Prefix
0DB8
/23 /32 /48 /64
Interface ID
Transitioning to IPv6 277
create their own local addressing hierarchy and to identify subnets.
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