[arin-announce] Removal of TLS 1.0 Support for Whois-RWS and RDAP

ARIN info at arin.net
Wed Feb 12 15:38:37 EST 2020

On 15 October 2019 and 13 January 2020, we announced plans to implement 
a change with ARIN’s Whois-RWS and RDAP services. We noted that this 
change may impact the way you interface programmatically with ARIN to 
query and retrieve information from these services.

With this change, ARIN no longer supports TLS version 1.0 for Whois-RWS 
and RDAP services because of 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.

ARIN implemented these changes to remove TLS 1.0 support on 12 February 
2020. We recommend that you review your clients that interface with the 
Whois-RWS and RDAP services, and verify that your clients are operating 
successfully with ARIN.

If you are still using TLS 1.0, you will need to make configuration 
changes to use TLS 1.1 or TLS 1.2 to successfully interface with ARIN. 
If you have additional questions, comments, or issues, please submit an 
Ask ARIN ticket using your ARIN Online account, or contact the 
Registration Services Help Desk by phone Monday through Friday, 7:00 AM 
to 7:00 PM ET at +1.703.227.0660.


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

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