AS3356 Announcing 2000::/12

Ryan Hamel administrator at
Fri Dec 9 18:08:27 UTC 2022

I know of a few people in a Discord that filter out anything bigger than /16 routes, would this be wise to implement as a best practice?


From: Warren Kumari <warren at> 
Sent: Friday, December 9, 2022 9:13 AM
To: Job Snijders <job at>
Cc: ryan at; North American Network Operators' Group <nanog at>
Subject: Re: AS3356 Announcing 2000::/12






On Thu, Dec 8 2022 at 12:38 PM, Job Snijders <nanog at <mailto:nanog at> > wrote: 


Hi all,

On Wed, Dec 07, 2022 at 08:24:54PM -0800, Ryan Hamel wrote:

AS3356 has been announcing 2000::/12 for about 3 hours now, an aggregate covering over 23K prefixes (just over 25%) of the IPv6 DFZ.

A few months ago I wrote: "Frequently Asked Questions about 2000::/12 and related routing errors":


Oh, that's a nice write-up. I must admit that it didn't occur to me that e.g 2000::/12 was likely something much more specific, but that someone missed the (probably) 6, 7, or 8 at the end, even though I've done this a few times myself…







Kind regards,



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