[arin-announce] New Base URL for Reg-RWS on 19 February

ARIN info at arin.net
Thu Feb 6 15:05:02 EST 2020

On 16 July and 30 October of 2019, we announced plans to implement 
changes to our RESTful API. We noted that these changes might impact the 
way you interface with ARIN Online for sending reassignment information 
and receiving reports through ARIN’s Registration RESTful Service 
(Reg-RWS). The changes are:

1. The base URL https://www.arin.net/REST will be no longer be available 
for Reg-RWS. You must change your base URL to https://reg.arin.net to 
interface with ARIN’s Reg-RWS service. The base URL reg.arin.net has 
been in place for seven years as the improved way of interfacing with 
ARIN via Reg-RWS.
2. ARIN will no longer be supporting TLS 1.0 for Reg-RWS’s transport 
layer. There are well-known security issues with this protocol. We will 
continue to support TLS 1.1 and 1.2. Please make sure your client 
implementation will support TLS 1.1 or 1.2. Read 
for further details.

The change to TLS support was completed successfully, but some customers 
were not ready for the change to the Reg-RWS base URL and requested a 
short delay. In order to allow these customers additional time to update 
their systems, we reverted that change temporarily.

We will move ahead with changing the base URL to https://reg.arin.net on 
19 February following additional outreach to the impacted customers who 
contacted ARIN. We will send a follow-up confirmation to the community 
once that change is completed. We strongly recommend that you review 
your clients that interface with the Reg-RWS service and make any 
required configuration or code changes.


Mark Kosters
Chief Technology Officer
American Registry for Internet Numbers (ARIN)

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