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IPv6 addressing confusion

Kuldeep singh
Level 1
Level 1

Hi Experts (Only Experienceholders),

What is exact address format of IPv6 to assign to any

Router or computer / Laptop ? I have seen many posts

and online articles where information about IPv6 is not

clear. I am giving here some examples like as

IPv6 address =   2001:0DB8:1111:2222::1/64

(in this example, there are only 5 octet and sign :: comes in last) 

                        OR

IPv6 address =   fe80::2e0:b6ff:fe01:3b7a

(in this example, there are only 5 octet and sign :: comes in starting)

                       OR

IPv6 address =  2001:410:1:2:212:43FF:FEE3:C600

(in this example, there are 8 octet and no :: sign)

KS

10 Replies 10

Nagendra Kumar Nainar
Cisco Employee
Cisco Employee

Hi Kuldeep,

IPv6 address is of 128 bit length (or 8 octect  length). Inorder to have it user friendly (to some extent), the text  representation is defied in a way that concecutive zeros can be denoted  with :: symbol.

For example, 2001:0DB8:1111:2222::1/64 is actually 2001:0DB8:1111:2222:0000:0000:0000:0001/64

Similarly, fe80::2e0:b6ff:fe01:3b7a is actually FE80:0000:0000:0000:02e0:b6ff:fe01:3b7a.

Below RFC will give you a better understanding on the text representation,

http://tools.ietf.org/html/rfc5952

HTH,

Nagendra