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Planning for IPv6

Introduction

Are you ready to deploy IPv6, but you're not sure where to begin? Whether you are an end user or an Internet Service Provider (ISP), ARIN can help you determine how much IPv6 address space is appropriate for your organization.

To get started, select whether your organization is an end user or Internet Service Provider:

End Users

End users operate networks that do not provide Internet access to external customers. End users that are not ISPs but do provide Internet connectivity to users (for example, universities) may apply either as end users or as ISPs.

Step 1: Verify You Qualify

If you meet any of the criteria below, you qualify to receive IPv6 address space:

  • Have an IPv4 assignment from ARIN or one of its predecessors
  • Intend to immediately be IPv6 multi-homed
  • Have 13 end sites (offices, data centers, etc.) within one year
  • Use 2,000 IPv6 addresses within one year
  • Use 200 /64 subnets within one year
Number of End Sites Block Size

1 site

/48

2-12 sites

/44

13-192 sites

/40

193-3,072 sites 

/36

3,073+ sites

/32

Step 2: Determine Your Block Size

IPv6 block size is based on the number of end sites in your network, not on the number of IP addresses you anticipate using. End sites are physical locations such as offices and data centers.

Each end site will generally be assigned one /48 subnet. You can determine the block size you qualify for based on the total number of end sites in your network (see table at right). This should include all existing end sites as well as any new end sites that will be deployed within one year. 

Step 3: Submit Your Request

Submit your request through your ARIN Online account.

Internet Service Providers (ISPs)

Networks that provide traditional Internet access (cable, fiber, wireless, etc.) and hosting providers that operate services which provide Internet access (colocation, dedicated servers, virtual private servers, etc.) should apply as ISPs. End users that are not ISPs but do provide Internet connectivity to users (for example, universities) may apply either as ISPs or end users.

Step 1: Verify You Qualify

If you meet any of the criteria below, you qualify to receive IPv6 address space:

  • Have an IPv4 allocation from ARIN or one of its predecessors
  • Intend to immediately be IPv6 multi-homed
  • Have a plan to make 50 assignments within five years

Step 2: Determine Your Block Size

IPv6 block size is based on the number and size of subnets to be assigned to customers, not on the number of IP addresses required by customers. ISPs will typically assign one subnet (/48 or smaller) to each customer.  The default /32 minimum allocation is sufficient for many ISPs since it contains 65,536 /48 subnets to assign to customers. ISPs may also opt to request a smaller /36 allocation.

Qualification for blocks larger than /32 is based on:

  • the subnet size to be assigned to customers (typically /48)
  • the number of serving sites (customer aggregation sites such as data centers or regional hubs) in the ISP’s network
  • the number of customers served by the largest serving site in the ISP’s network

If you are applying for a block larger than /32, make sure to inform us of the block size to be assigned, number of serving sites, and number of customers served by the largest serving site so we can determine the appropriate block size to meet your needs.

Step 3: Submit Your Request

Submit your request through your ARIN Online account.

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