[arin-announce] New Base URL for Reg-RWS

ARIN info at arin.net
Wed Feb 19 16:20:38 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).

These changes consist of:

1. The base URL https://www.arin.net/REST will 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 version 1.0 for Reg-RWS’s 
transport layer because of well-known security issues with this version 
of the 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 on 4 February, 
2020. On 19 February 2020, we completed the change of the base URL to 


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

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