Redundant AS's

Geoff Huston gih at
Sat Mar 21 02:46:19 UTC 2009

On 18/03/2009, at 6:18 PM, Henk Uijterwaal wrote:
> When I look at this more recently, the conclusion still seems to be
> valid: we'll run out of 16 bit ASN's somewhere in 2011 to 2013.  There
> are a lot of unused ASN's out there.

I make it 25 June 2011 given current use patterns ( 

> Recovering them will postpone the
> problem by a few years but it won't solve it.  The basic problem with
> recovery is how to decide if an ASN is really no longer used/needed.
> There is (still) no mechanism to do this.

thats the problem - there are current 14902 AS numbers that allocated  
but not visible in my part of the public Internet, but its entirely  
inknown to what extent these numbers are used in various forms of  
private or semi-private contests


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