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AS Numbers

Obtaining an AS Number

In accordance with Section 2.2 of the Number Resource Policy Manual (NRPM), ARIN issues Internet number resources for use within its region. An Autonomous System is a connected group of IP networks that adhere to a single unique routing policy that differs from the routing policies of your network's border peers. An ASN is a globally unique number used to identify an Autonomous System. An ASN enables an AS to exchange exterior routing information with neighboring ASes. Sites that do not require a unique ASN should use one or more of the ASNs reserved for private use. Those numbers are 64512 through 65535.

The policies governing AS number allocation and maintenance can be found in the Number Resource Policy Manual.

Step 1: Requirements

Review ARIN's AS policies to ensure your request meets the requirements. Requesting resources from ARIN indicates you have read and agree to abide by these policies.

When completing the request, your organization must first establish justification for the request. Justification can be made by meeting at least one of the following two requirements.

Autonomous System (AS) Number
Type of Resource Request Criteria to Receive Resource
  • provide the exterior gateway protocol to be used
  • provide the IP addresses currently in use on your network
  • provide the AS number and name of each of your upstream providers/peers
  • provide verification (reassigned address block, a copy of your signed contract) your organization has contractually agreed to service with at least two of the upstream providers/peers listed on your request
  • if requesting an additional AS number, provide documentation detailing how the network for the requested ASN is autonomous from all existing ASes in your network
Unique Routing Policy
  • demonstrate the AS's routing policy will differ from the routing policies of its border peers
  • if requesting an additional AS number, provide documentation detailing how the network for the requested ASN is autonomous from all existing ASes in your network

Step 2: Submit Request

To request an ASN, 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 ASNs > Request 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 ASN Request from the list to be taken to the form.  Please follow all instructions and complete all the necessary fields.

Step 3: Verification

We will verify receipt of your request upon successful submission by issuing a ticket number. Use Tickets & Messages > 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 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.

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: 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 ninety (90) 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 for further explanation.

Step 6: 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 Contact, 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 Payments & Billing 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 759477
Baltimore, MD 21275-9477

For payment by wire transfer:

  • Email a request to, 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 7: Assignment

ARIN completes the ASN assignment within two (2) business days of ARIN's receipt of the organization's registration fee and a signed Registration Services Agreement (RSA). The assignment of an ASN does not qualify organizations for ARIN membership. Only organizations that receive and pay for a direct allocation of IP address space from ARIN are automatically accorded membership.

As membership is open to all qualifying interested parties, any organization or individual may become a member of ARIN by completing a Membership Application Form and paying an annual membership fee.

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

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Registration Services Help Desk

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Fax: +1.703.997.8844
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