Get a head start: opt-in for an IPv6 address

Popularity of the Internet

Everything will start...

At the origins of the Internet, nobody was able to imagine the passion it would evoke. Also, when the question of how to identify machines on the network arouse, it was estimated that the IPv4 address on 32 bits would be sufficient.

With the arrival of the mobile, the growth of connections, the proliferation of services, but also "web-emerging" country requests (Africa, Asia, etc..), the number of available IPv4 is almost exhausted.

To remedy this forthcoming shortage, engineers have been working since 1998 on a new protocol. This allows, among others, to overcome that IP number limit. One solution was to move from a coding addresses of 32 bits to 128 bits. Thus IPv6 was born.

IPv6 receives an address as 128 bits

What's the difference between 128 bits and 32 bits?

A bit can take two values: 0 or 1. In practice this means that each element connected to the IPv4 network is assigned a code of 32 bits. A quick calculation shows that this is potentially 2 ^32 elements connected to the network, or about 4 billion machines (4 294 967 296). Even then, they are not all available!
An element connected in IPv6 receives an address of 128 bits, giving 2 ^ 128 elements that can potentially be connected to the network. To give you a idea, it's estimated that this would give "60,000 billion billion addresses per capita" (source: IPv6, Theory and Practice, Gisele Cizault, Ed O'Reilly, November 2005) .

The large number of available IP addresses will have two collateral consequences.

Network Adress Translation
Disappearance of the NAT

Network Address Translation (NAT) simplifies the process, which allows machines on a LAN to communicate with the Internet without the need of multiple external IP addresses.
If the NAT has a real interest when the network is IPv4, because it allows a reduction in the amount of IPs that need to be provided, it will become obsolete in IPv6 given the amount of available IP addresses.

Multiple Addresses

The abundance of available IP addresses will enable the allocation of multiple addresses to a single machine. So for example it will allow the segmentation of services.


IPv6 :2001:0DB8:0000:0000:0400:A987:6543:210F

But rest assured that the DNS is IPv6 compatible.

IPv6 it's also...

  • A Simplified header format that accelerates the routing process;
  • Authentication and confidentiality are included as standard, which helps its deployment;
  • The auto-configuration is an integrated protocol and is no longer dependent on a third-party service (DHCP);
  • An improved multi-recipient distribution as standard;
  • Considering mobility through the concept of "Home Address (HoA)", or main-address, and a temporary address called Care-of Address (CoA).

... OVH is ready! Are you?

IPv6 options can be found on co-location, dedicated servers and shared hosting.