What is the percentage difference between the number of possible addresses with IPv4 and IPv6?

As already mentioned, IPV6 uses 128-bit addresses and therefore has 2 128 numbers of IP possible, that is:

  

340282366920938463463374607431768211456 Possible combinations.

     

(340 undecons) 282 deciles 366 nonillions 920 octillions 938 setirons 463 sextilons 463 quintillions 374 quadrillion 607 trillion 431 billion 768 million 211 thousand 456)

While IPV4 uses 32-bit addresses and has 2 32 numbers of IP possible, corresponding to:

  

4294967296 possible combinations

     

(4 billion 294 million 967 thousand 296)

That is, it is a very, very, very high number.

While in IPV4 template we have something similar to this:

  

192.168.0.1
  4 groups with up to 3 decimal digits.

So, for each set of 3 digits we have:

  

2 8 * 2 8 * 2 8 32
  2 8 = 256. 2 32 = 4294967296

No IPV6 has IP this way:

  

2001: 0db8: 85a3: 08d3: 1319: 8a2e: 0370: 7344
  Eight groups of 4 hexadecimal digits.

This difference in notation has enabled a greater range of possibilities, which can be calculated as follows:

  2 16 * 2 16 * 2 16 / sup> * 2 16 * 2 16 * 2 16 ) = 2 128 >
  because the hexadecimal numbers comprise 16 values from 0 to 9 and from A to F   then 2 128 matches the 340282366920938463463374607431768211456 mentioned above.

With a simple 3 rule we have to:

  

2 128 = 100%
  2 32 = x

     

2 128 x = 2 32

     

x

     

x = 1/79228162514264337593543950336
  That is, IPV6 is 79.228.162.514.264.337.593.543.950.336% greater than IPV4
  And IPV4 has:

     

1.262177448353618888658765704452457967477130296174436807 ... × 10 -29 % of the IPV6 addresses

Sources

Free translation of Wikipedia content in English :

  

IPv6 uses 128-bit addresses, allowing 2 128 or 3.4 × 10 38 addresses, that is, more than 7.9 × 10 28 times more than IPv4.

This means, according to the comments posted below by @Vargas and @tsippert:

• IPV6 is 79,000,000,000,000,000,000,000,000,000% higher than IPV4
• IPv4 has only 0.000000000000000000000012632257% of IPv6 addresses

IPv4 has 32 bits, IPV6 has 128 bits.

It is so absurdly large that it is possible to say that IPV4 = 0% of IPV6