## 3. What do IPv6 addresses look like?

As previously mentioned, IPv6 addresses are 128 bits long. This number of bits generates very high decimal numbers with up to 39 digits:

```2^128-1: 340282366920938463463374607431768211455
```

Such numbers are not really addresses that can be memorized. Also the IPv6 address schema is bitwise oriented (just like IPv4, but that's not often recognized). Therefore a better notation of such big numbers is hexadecimal. In hexadecimal, 4 bits (also known as ”nibble”) are represented by a digit or character from 0-9 and a-f (10-15). This format reduces the length of the IPv6 address to 32 characters.

```2^128-1: 0xffffffffffffffffffffffffffffffff
```

This representation is still not very convenient (possible mix-up or loss of single hexadecimal digits), so the designers of IPv6 chose a hexadecimal format with a colon as separator after each block of 16 bits. In addition, the leading "0x" (a signifier for hexadecimal values used in programming languages) is removed:

```2^128-1: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
```

```2001:0db8:0100:f101:0210:a4ff:fee3:9566
```

For simplifications, leading zeros of each 16 bit block can be omitted:

```2001:0db8:0100:f101:0210:a4ff:fee3:9566  ->
¬ 2001:db8:100:f101:210:a4ff:fee3:9566
```

One sequence of 16 bit blocks containing only zeroes can be replaced with “::“. But not more than one at a time, otherwise it is no longer a unique representation.

```2001:0db8:100:f101:0:0:0:1  ->  2001:db8:100:f101::1
```

The biggest reduction is seen by the IPv6 localhost address:

```0000:0000:0000:0000:0000:0000:0000:0001  ->  ::1
```

There is also a so-called compact (base85 coded) representation defined in RFC 1924 / A Compact Representation of IPv6 Addresses (published on 1. April 1996), never seen in the wild, probably an April fool's joke, but here is an example:

```# ipv6calc --addr_to_base85 2001:0db8:0100:f101:0210:a4ff:fee3:9566
9R}vSQZ1W=9A_Q74Lz&R
```

Info: ipv6calc is an IPv6 address format calculator and converter program and can be found here: ipv6calc homepage (Mirror)