IPv6 provides enough addresses to allow the Internet to continue to expand and the industry to innovate. It is not, however, directly compatible with IPv4, meaning that a device connected via IPv4 cannot communicate directly with a device connected using IPv6.
Show or Hide answer What is IPv6?

Internet Protocol version 6 (IPv6) was designed by the Internet Engineering Task Force (the IETF) to expand the amount of IP addresses available. IPv6 addresses are 128-bit addresses, expressed in hexadecimal notation (for example, 2001:DB8:8::260:97ff:fe40:efab).

There are 2128 IPv6 addresses, or roughly 340 trillion, trillion, trillion. This huge amount of addresses is expected to accommodate the predicted expansion of the Internet and Internet-related services over the coming years.

IPv6 was introduced in 1999 and has been in use since then. This means that the core standards are stable and have been well tested in research and operational contexts.

Show or Hide answer Do I need to be a member of the RIPE NCC to receive an IPv6 allocation?

Yes. IP address space is only allocated to RIPE NCC members. However, smaller Internet Service Providers (ISPs) and End Sites can obtain an IPv6 address space assignment or sub-allocation from an upstream provider. See the RIPE Document "IPv6 Address Allocation and Assignment Policy" for more information about IPv6 allocations and assignments.

Show or Hide answer How can I get an IPv6 allocation from RIPE NCC?

To get an IPv6 allocation from the RIPE NCC, you must be a Local Internet Registry (LIR)/RIPE NCC member. If you are already an LIR/RIPE NCC member, you can request an IPv6 allocation by completing the IPv6 First Allocation Request Form. To receive an IPv6 allocation, you will need to have a plan to make sub-allocations to other organisations and/or make End Site assignments within two years.

See the RIPE Document "IPv6 Address Allocation and Assignment Policy" for more information about receiving an IPv6 allocation.

Show or Hide answer Which size of IPv6 allocation can I get from the RIPE NCC?

The minimum allocation size for an IPv6 allocation to an LIR is a /32. Up to a /29 will be allocated upon request with no additional documentation required. You may qualify for an allocation greater than a /29 by submitting documentation that reasonably justifies the request, for example number of existing users and the extent of the organisation's infrastructure.

Show or Hide answer If I have a /32 IPv6 allocation, how can I get more address space?

Every RIPE NCC member (LIR) may request up to a /29 of initial IPv6 address space, without submitting any documentation. If you hold more than one IPv6 allocation, all existing blocks can be extended up to a /29. You can request this extension by submitting the IPv6 Additional Allocation Request Form through the LIR Portal or by emailing it to .

Show or Hide answer Does "slash notation" differ between IPv6 and IPv4?

Yes. Slash notation for IPv4 and IPv6 is based on the same principle but the amount of addresses that each slash represents differs between the two protocols. It is difficult to make direct comparisons between IPv4 and IPv6 because of the very large numbers involved in IPv6 addressing. However, the example below gives a simple overview:

In IPv4 addressing, a /32 is equivalent to one single IP address.

In IPv6 addressing, a /32 results in 65,536 subnets, each of which is the size of a /48. Each /48 contains 65,536 /64s and each /64 contains 264 addresses. This means that each IPv6 /32 allocation contains 4.29 billion /64s (4.29 billion x (264 ) IPv6 addresses, which results in a number too large to be meaningful in print).

A /64 subnet is the smallest IPv6 assignment that an End User can receive according to the current IPv6 assignment policy. So, an End User assigned the smallest IPv6 assignment will receive 264 IPv6 addresses.

An End User assigned the smallest IPv4 assignment will receive one single IPv4 address.

CIDR Chart - IPv6


CIDR Chart - IPv4


Show or Hide answer What is a subnet?

A sub network (subnet) is a part of an organisation's network. A subnet may represent all the machines at one geographic location, in one building, or on the same local area network (LAN). Dividing a network into subnets allows the network to be connected to the Internet with a single shared network address. Without subnets, a network might use multiple connections to the Internet, one for each physically separate sub network. When referring to IPv6 addressing schemes, subnets are used to describe the amount of addresses contained within IPv6 slash notation.


Show or Hide answer Are IPv6 address assignment policies different from the IPv4 ones?

Yes. Technical differences between IPv4 and IPv6 mean that there are different policies for IPv4 and IPv6 address space management and assignment. However, all policies are based on the same principles and the processes used to assign IPv4 and IPv6 are the same.

All RIPE policies are proposed, discussed and approved by the RIPE community using the RIPE Policy Development Process (PDP).

Show or Hide answer Is it possible to get an IPv6 Provider Independent (PI) assignment?

Yes. Please see Section 7 of the the RIPE Document "IPv6 Address Allocation and Assignment Policy" for more details about IPv6 Provider Independent (PI) Assignments.

Show or Hide answer Can an Internet Exchange Point (IXP) get an IPv6 assignment?

Yes. However, there are separate procedures and policies for IPv6 assignments to IXPs. Please see the RIPE Document "IPv6 Address Space Policy for Internet Exchange Points" for more information.

Show or Hide answer Is it possible to get an IPv6 multicast space allocation?

No. Currently, the RIPE NCC only allocates IPv6 unicast space. Please see the RIPE Document "IPv6 Address Allocation and Assignment Policy" for more information.

Show or Hide answer Do I need to register all the assignments made from my IPv6 allocation?

Yes. When an organisation holding an IPv6 address allocation makes IPv6 address assignments, it must register these assignments in the appropriate RIR database. For more information on this, please see the RIPE Document IPv6 Address Allocation and Assignment Policy.

Show or Hide answer How do I document assignments made from my IPv6 allocation?

For information on how to document assignments made from your IPv6 allocation, including the relevant rules, constraints and options, please see the RIPE document Documenting IPv6 Assignments in the RIPE Database.

Show or Hide answer How do I determine which values to use for the "status" attribute when registering assignments from my IPv6 allocation?

There are three different values that can be used for the "status:" attribute for objects registered from an INET6NUM object with the "status: ALLOCATED-BY-RIR":

  • ALLOCATED-BY-LIR: For allocations made by an LIR or an LIR's downstream customer to another downstream organisation. Assignments made from this block need to be registered with the status "AGGREGATED-BY-LIR" or "ASSIGNED" as applicable.
  • ASSIGNED: For assignments made to an End User site and registered separately by the LIR in the RIPE Database.
Show or Hide answer How do I apply for a temporary IPv6 block?

It is possible to request temporary resources for deployment for a specific time-limited purpose. For details, see the FAQ: Temporary Internet Number Assignment.