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ISP Initial IPv4 Allocations

In accordance with Section 2.2 of the Number Resource Policy Manual (NRPM), ARIN issues Internet number resources for use within its region. Allocations of IPv4 address space are made to organizations like Internet Service Providers (ISPs) for the purpose of reassigning space to their customers. Assignments of IPv4 address space are made to end-user organizations for running internal networks, and not for subdelegation of those addresses outside their organization. End-users who are not connected to an ISP and/or who do not plan to connect to the Internet are encouraged to use private IP numbers reserved for non-connected networks.

If you are unsure whether you are an ISP or an End-user, send an message to Ask ARIN via ARIN Online, or email hostmaster@arin.net and provide detailed information as to how you use address space to support the products/services you offer.

The exact policies covering the delegation of IPv4 resources can be found in the ARIN Number Resource Policy Manual (NRPM).

Information regarding IPv4 Requests: IPv4 Countdown Plan and Depletion – FAQ

Step 1: Requirements

Review ARIN's policies to ensure your organization meets the requirements for the type of resource you plan to request.  Requesting resources implies you have read and agreed to abide by these policies.

The ARIN Number Resource Policy Manual (NRPM) is the definitive source for resource requirements.  The table below offers an "at-a-glance" summary for the necessary criteria.  Please refer to the NRPM for more details and in case of questions.

IPv4 – Initial Allocations
Type of Resource Request Criteria to Receive Resource
Standard or not multi-homed
/20 minimum allocation
NRPM 4.2.2.1
  • have a /20 (or equivalent) reassigned to your organization by your upstream provider(s) via SWIP or RWhois
  • provide data to verify the /20 (or equivalent) is efficiently utilized
Multi-homed
/22 minimum allocation
NRPM 4.2.2.2
  • provide verification your organization intends to multi-home using the requested block
  • have the following amount of space (or equivalent) reassigned to your organization by your upstream provider(s) via SWIP or RWhois:
    • /23 (to receive a /22 initial allocation)
    • /22 (to receive a /21 initial allocation)
    • /21 (to receive a /20 initial allocation)
  • provide data to verify the provider-assigned addresses are efficiently used
  • agree to use half of the requested address block to renumber out of your current address space

Caribbean Region
/22 minimum allocation
NRPM 4.9


Note: organizations within the Caribbean and North Atlantic Islands region may qualify under other policies, like Multi-homed or Immediate Need

  • be an ISP from the Caribbean and North Atlantic Islands sector of the ARIN region
  • have a /22 (or equivalent) reassigned to your organization by your upstream provider(s) via SWIP or RWhois
  • provide data to verify the /22 (or equivalent) is efficiently utilized

Immediate Need
20 minimum allocation(single-homed)
/22 minimum allocation
(multi-homed)
/16 maximum allocation
NRPM 4.2.1.6


Note: requests approved under this policy are exceptional

  • provide a comprehensive network topology
  • provide a comprehensive deployment schedule outlining the immediate use of the requested IP address block
  • provide copies of current signed customer contracts
  • provide copies of signed connectivity agreements
  • provide copies of paid invoices for the equipment that will support the immediate need
  • if requesting a /22 or a /21, provide verification your organization intends to multi-home using the requested block

Step 2: Submit Request

To request an allocation, your organization must first establish Point of Contact (POC) handles and an Organization Identifier (Org ID).  Your ARIN Online account must be linked to the admin or Tech POC on your Org ID to submit resource requests.

Once POCs and Org IDs are registered, you can complete and submit a request through your ARIN Online account by clicking on REQUEST RESOURCES in the left navigation bar. The resulting page will show a list of Org IDs you have permission to manage.  Select the Org ID that you need to request resources for and then select the Request Resources icon in the right-hand toolbar. You will see a list of resource request options.  Select ISP IPv4 Request from the list to be taken to the form.  Please follow all instructions and complete all the necessary fields.

We will typically require the following utilization data to complete our review of your request:

  • list of CIDR prefixes/ranges assigned to dynamic pools with service type (e.g. DSL, wireless), city/region served, peak utilization percentage, and number of customers served for each pool
  • list of IP addresses/subnets statically assigned to customers along with the corresponding customer name for each IP address/subnet
  • list of IP addresses used for web hosting along with at least one customer domain name hosted on each IP address
  • list of IP addresses/subnets assigned to internal equipment/infrastructure along with the corresponding hostname/device name for each IP address/subnet

You may want to attach this data to your initial submission in text/spreadsheet format to help ARIN review your request as quickly as possible.

Step 3: Verification

We will verify receipt of your request upon successful submission by issuing a ticket number. Use TRACK TICKETS to check the status of your request.

Step 4: Review Process

We will respond to requests within two (2) business days. We may request additional information; these requests will be sent to your ARIN Online Message Center.  For each question and response cycle, we will generally respond within two (2) days.  If you do not reply within ninety (90) days, the ticket will be closed. A request for additional information does not imply a request denial.

ARIN has implemented phase two of its IPv4 Depletion Countdown procedures.  All /16 and larger IPv4 requests are now being reviewed on a first in, first out basis by a team of senior Registration Services staff.  We will respond to your request after we've reviewed and responded to all /16 and larger requests that were received prior to your request.  This applies to both our initial reply to your ticket as well as all subsequent replies.  As a result, our response time may exceed our usual two day turnaround.  For more information see ARIN's IPv4 Depletion Countdown page.

For questions about pending requests, send a reply to the ticket through ARIN Online, or call ARIN's Registration Services Help Desk at +1.703.227.0660. When you call, have your ticket number and any requested documentation available, and have access to the ARIN website. For further follow-up, supply the name of the ARIN Resource Analyst who assisted you on your prior call. Click here for additional guidance on calling the Help Desk.

Step 5: Officer Attestation

Prior to approval, ARIN will send an email with all data received on the request to an officer of the company for certification.  The officer must reply and verify that the data submitted is accurate.

Submit any questions regarding officer certification to Ask ARIN within ARIN Online for further explanation.

Step 6: Request Approval

ARIN notifies the submitter of request approval by posting a message to the Message Center in ARIN Online The approval is good for sixty (60) days. If your organization does not follow up on the approval within that time, you will need to resubmit your request.

If a request is rejected and you feel proper justifications were met, use the Ask ARIN feature in your web account or send an email to hostmaster@arin.net for further explanation.

Step 7: Fees & Registration Services Agreement

Please review the ARIN Fee Schedule to learn more about how fees are determined.

Upon approval and within one business day, you will receive a detailed message that will include: how to update or designate the Billing POC, an invoice, ARIN W-9, and instructions to download the Registration Services Agreement (RSA).  

There are two ways to submit online payments to ARIN:

  • Log into ARIN Online and select BILLING INFO from the left-hand side,
  • Or click here.
    • You will need to provide the appropriate Org ID, Invoice number, and the exact amount due on the invoice.

For payments by check, send to:

American Registry for Internet Numbers
P.O. Box 79010
Baltimore, Maryland 21279-0010

For payment by wire transfer:

  • Email a request to billing@arin.net, include the invoice number, the organization name, and Org ID.

Payment information is not accepted by phone. We do not accept purchase orders as the equivalent of payment. The approval request can be dependent on the billing status of the Org ID in question. Outstanding fees due to ARIN must be paid before additional resources are issued or transferred.

Submission of Signed Registration Services Agreement (RSA)

All applicants requesting resources from ARIN are required to sign the Registration Services Agreement (RSA). The RSA must be signed and returned in its entirety for validation before ARIN issues or transfers resources. The language of the agreement cannot be altered or modified. The entire document is required with information to be inserted on page 1 and completing page 9, all applicable fields. The Billing Contact is optional if duplicate of Authorized Officer. *Please ensure the contract is signed by an Authorized Officer of the Company.

Need Help with the ARIN Agreement: 703-227-9886, reply to your ARIN Online ticket, or Ask ARIN.

Remit the completed ARIN agreement by one of the following methods:

  • Reply to your ARIN Online ticket, attaching the signed RSA,as a PDF
  • Fax:  703-227-0671
  • Post:
    • ARIN
      Attention: Financial Services Department
      3635 Concorde Parkway, Suite 200
      Chantilly, VA 20151

ARIN will counter-sign and return a copy for your records after the payment has been confirmed.

Step 8: Allocation

ARIN completes the allocation of the address block to the organization within two (2) business days of ARIN's receipt of the registration fee and a signed RSA. You will receive a notification to your Message Center and the ticket log will be updated to show that the allocation is completed.

Organizations that receive a direct allocation of IP address space from ARIN are automatically accorded membership for as long as they continue to pay any fees related to their allocation. This membership is associated only with the Org ID holding the allocation.

It is not necessary to become a member of ARIN prior to applying for IP address space, nor will doing so make it easier to obtain IP addresses. All applicants must meet policy requirements and justify their allocation requests based on utilization criteria.

Automatic membership based on a direct allocation of IP address space from ARIN is terminated when the address space is transferred to another entity, returned to ARIN, or revoked due to nonpayment. On the day the transfer process is complete, membership and the accompanying voting rights are transferred to the entity acquiring the address space.

Each ARIN member is asked to name a designated member representative (DMR). This is the only person eligible to vote in ARIN online elections (Bylaws, Article III, Section 3.b.). Requirements for the DMR can be found on the DMR page.