Your IP address could not be determined at this time.

Legacy Registration Services Agreement


The Legacy Registration Services Agreement (Legacy RSA or LRSA) has been offered to those organizations and individuals in the ARIN service region who hold legacy Internet number resources not covered by any other Registration Services Agreement (RSA) with ARIN. Legacy holders who sign up have been guaranteed the same services provided to other organizations who have a signed RSA with ARIN. Legacy holders will still enjoy this benefit; however, will now be executing a combined RSA document also offered to non-legacy holders. 

The combined RSA recognizes the distinct status of Legacy holders while ensuring consistency of services provided to all registrants covered by the combined RSA. A legacy number resource is an IPv4 address or Autonomous System Number (ASN) that was originally issued to the current registrant by an Internet Registry (InterNIC or its predecessors) prior to ARIN's inception on 22 December 1997.

There is an annual maintenance fee associated with Legacy holders. The annual invoice will be sent to the designated billing Point of Contact (POC) approximately 60 days before it is due.

Note that ARIN will not reclaim unutilized address space from legacy holders who sign this RSA, nor will ARIN attempt to take away legacy resources from organizations that choose not to sign it. However, signing the RSA contractually locks in a set of rights, and thus reduces the risk of future change.

If you have questions, please see the "Legacy RSA " section of the Registration Services Agreement FAQ .

Legacy Application Process

Step 1

Send an email to to start the request process. You will need to provide the following information (putting "Legacy RSA Application" in the subject line):

  • Organization name
  • Organization ID
  • IP address blocks or ASNs to be covered
  • Contact information for the person submitting the request – should include name and phone number

Step 2

The requestor will receive an automated response that will include the ARIN ticket number. ARIN's Registration Services staff will evaluate the application to ensure that the submitted information is accurate and up to date. ARIN staff will contact the applicant if additional information is needed..

Step 3

If the application is approved, ARIN's Financial Services staff will send the Applicant a copy of the RSA for signature. The Applicant will then need to complete and submit the RSA. In addition to the signature and contact information for an authorized officer of the company, contact information for the appropriate billing contact must also be provided. ARIN accepts signed, but otherwise unaltered, RSAs via fax, email, or postal mail. The signed  RSA is not considered valid unless returned in its entirety.

The RSA is also available at:

Step 4

Upon successful evaluation of the submitted information and receipt of the signed and completed RSA, ARIN will notify the organization or individual. This marks the end of the application process and marks the beginning of the contractual agreement.

Step 5

Two months prior to the one-year anniversary of the date the RSA was signed, ARIN's Financial Services Department will send out an invoice for the annual legacy maintenance fee. The fee is due by the anniversary date. This billing event will reoccur annually. For additional details on the annual maintenance fee for legacy resources, please see the appropriate section of the ARIN Fee Schedule.

Search Related Content


full site search

Registration Services Help Desk

Interacting With ARIN

Monday through Friday
7:00 AM to 7:00 PM ET
Phone: +1.703.227.0660
Fax: +1.703.997.8844
Tips for Calling the Help Desk