ACSP Consultation 2022.4: Consultation on Requiring Two-Factor Authentication (2FA) for ARIN Online Accounts

Consultation Tracking Information

  • Requested By: Staff
  • Status: Closed
  • Comments Opened: Linked to Discussion Archives: 24 May 2022
  • Comments Closed: 24 June 2022
  • Suggestion Number: n/a

Consultation Description


In 2015, ARIN deployed a Time-Based One-Time password (TOTP) implementation of Two-Factor Authentication (2FA). Since the time of implementing that login security feature, 3.2 percent of ARIN Online users have opted to use 2FA with their accounts.

Since October 2020, the ARIN Online system has been subject to a series of dictionary-based password guessing attacks. In March of 2021, we conducted ACSP Consultation 2021.2: Password Security for ARIN Online Accounts on proposed improvements to increase account security. This consultation resulted in an agreement to move forward with several improvements that have subsequently been deployed. However, we continue to see frequent attacks on our log-in systems, and ARIN staff continues to be heavily engaged in mitigating these attacks. Accounts not using 2FA are susceptible to these attacks. We recently updated the community on this topic during ARIN 49 held in Nashville and online in April. You can review this information from the ARIN 49 Meeting Report by looking for the presentation titled “Brute Force Login Attacks”.

It is our intention to make 2FA mandatory for all existing and new ARIN Online accounts going forward. The security of ARIN Online accounts is paramount to the success of the registry, and we do not believe it is tenable to continue without making 2FA required for all ARIN Online accounts.

We are currently developing a second method of 2FA use with ARIN Online to add to our long-deployed TOTP implementation. In the coming months, we will deploy a Short Message Service (SMS) 2FA implementation, thereby adding a second 2FA option for ARIN Online users. At that time, users will be able to choose between two types of 2FA – SMS and TOTP. Adoption of TOTP 2FA has been limited in part due to perceived complexity, and the addition of SMS-based 2FA will provide a second option that is easier to use for many customers – and provide much more protection than the simple username-password condition of many ARIN Online user accounts today. (ARIN also plans on adding support for a third 2FA option in the future – Fast Identity Online 2 (FIDO2) – in response to community suggestions, but we do not believe it is prudent to delay requiring 2FA on ARIN Online accounts until that third option becomes available.)

Requiring 2FA For ARIN Online Accounts

By requiring 2FA for ARIN Online accounts that control number resources, the ARIN community should see stronger security for the registry, reduced risk of account fraud attempts, and increased confidence in the integrity of their ARIN resources.

ARIN intends to require 2FA for all ARIN Online accounts shortly after SMS-based 2FA authentication is generally available. We are seeking confirmation from the ARIN community regarding this plan, and ask the following consultation question:

Once SMS-based two-factor authentication (2FA) is available for ARIN Online, do you believe ARIN should not proceed with requiring 2FA authentication (SMS-based or TOTP) for all ARIN Online accounts? If so, why?

The feedback you provide during this consultation will help form our path forward to increasing the security of ARIN Online for all customers. Thank you for your participation in the ARIN Consultation and Suggestion Process. Please provide comments to You can subscribe to this mailing list at:

This consultation will remain open through 5:00 PM ET on 24 June 2022.

ARIN Actions

ARIN thanks those who provided valuable feedback during this consultation on requiring Two-Factor Authentication (2FA) on all ARIN Online accounts. This important feedback will help form our path forward to increasing the security of ARIN Online for all customers.


John Curran
President and CEO
American Registry for Internet Numbers (ARIN)