Ipv6 address classification (about IPV6 addresses starting with FE80)

Source: Internet
Author: User


From IPV6 details


Ipv6 addresses can be divided into three categories: unicast addresses, wildcard addresses, and multicast addresses (many introductions on the following two types of networks)

Unicast addresses can also be divided into global unicast addresses, local unicast links, and local unicast sites.

See the IPV6 Address Allocation Table:

This allocation scheme supports direct distribution of clustered addresses, local addresses, and multicast addresses, and reserves space for n s a p address and I P X address.

The remaining address space will be reserved for future use. It can be used for existing extensions (such as adding a clustered address) or for new purposes (such as separating locators and identifiers ).

5% of the address space is initially allocated, and 5% of the remaining address space will be reserved for future use.


1. Global unicast addresses that can be aggregated (simply put, such unicast addresses are common IPV6 addresses available on the Internet)

All globally available unicast addresses are defined in [a g r. This address format is designed to support clustering based on the current supplier,

It also supports the new clustering type called the Exchange Board. Its Combination enables efficient routing clustering to be used to directly connect to the supplier and connect to the exchange

The two websites.

A site can be connected to any of the two types of clustering points. The formats of I P v 6 multicast addresses that can be clustered around the world are as follows:


2. Local IPV6 unicast address (including link local Unicast address and site local Unicast address)

2.1 local unicast link address

Specifies two types of local unicast addresses: Local Link and local site. The local link address is used on a single link,

The local site address is used on a single site.

The local link address format is as follows:

Note that this address is an IPV6 address starting with FE80: x.

The local link address is designed for addressing such as automatic Address Configuration, neighbor discovery, or a single link without a router.

A vro cannot forward any package with the local source address or destination address of the link to another link.


2.2 The local site address has the following address format:

In hexadecimal notation: FEC0: X

The local site address is designed for internal addressing of sites that do not require a global prefix. The vro should not forward data outside the site to the local site or

Any package of the destination address

(Is it the same as the private address of class 192.168? )


For example, I am from CERNET and have a global unicast IPV6 address (in the case of one network interface, there are actually many tunnels and virtual NICS)

2001: 250: 4000: 4000: f80f: 6d4c: 4310: xxxx is the IPV6 address that can appear on the Internet.

Check the local IPV6 address: fe80: f80f: 6d4c: 4310: b18e % 11. This address can only correspond to one link!

% 11 is your network interface identifier, such as flag. (some of them are displayed after you enter route print)


IPV6 is too complicated. I suggest you take a look at the book "IPV6 details ".




Author fdl19881

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